1986 IUCN red list of threatened animals - IUCN Conservation Monitoring Centre. (International Union for Conservation of Nature and Natural Resources, 1986)

1988 IUCN red list of threatened animals (1988)

1988 IUCN red list of threatened animals (1988)

1990 IUCN red list of threatened animals (1990)

1994 IUCN red list of threatened animals (1994)

1994 IUCN red list of threatened animals (1994)

Alauda : revue internationale d'ornithologie - Muséum national d'histoire naturelle (France) (Société d'études ornithologiques de France, 1969)

Alauda : revue internationale d'ornithologie - Muséum national d'histoire naturelle (France) (Société d'études ornithologiques de France, 1971)

Archiv für Naturgeschichte (Nicolai, 1862)

Atlas of zoogeography; a series of maps illustrating the distribution of over seven hundred families, genera, and species of existing animals - Clarke, William Eagle, 1853 -1938 (Pub. at the Edinburg Geographical Institute, by J. Bartholomew & Co, 1911)

Atlas of zoogeography; a series of maps illustrating the distribution of over seven hundred families, genera, and species of existing animals - Clarke, William Eagle, 1853 -1938 (Pub. at the Edinburg Geographical Institute, by J. Bartholomew & Co, 1911)

Bericht über die Leistungen in der Naturgeschichte der Vögel - Pelzeln, August von, 1825 -1891 (1847)

The birds of Africa, comprising all the species which occur in the Ethiopian region - Sclater, William Lutley, 1863 -1944 (Published for the author by R.H. Porter (18 Princes Street, Cavendish Square, W.), 1896)

The birds of Africa, comprising all the species which occur in the Ethiopian region - Sclater, William Lutley, 1863 -1944 (Published for the author by R.H. Porter (18 Princes Street, Cavendish Square, W.), 1896)

The birds of Celebes and the neighbouring islands - Meyer, Adolf Bernhard, 1840 -1911 (R. Friedländer & Sohn, 1898)

The birds of Celebes and the neighbouring islands - Meyer, Adolf Bernhard, 1840 -1911 (R. Friedländer & Sohn, 1898)

The birds of Celebes and the neighbouring islands - Meyer, Adolf Bernhard, 1840 -1911 (R. Friedländer & Sohn, 1898)

The birds of Celebes and the neighbouring islands - Meyer, Adolf Bernhard, 1840 -1911 (R. Friedländer & Sohn, 1898)

The birds of New Guinea and the adjacent Papuan islands : including many new species recently discovered in Australia - Sharpe, Richard Bowdler, 1847 -1909 (Henry Sotheran & Co, 1875)

Birds of the world; a popular account - Ridgway, Robert, 1850 -1929 (Holt, 1909)

Birds: the elements of ornithology ; with 174 illustrations whereof 140 are original drawings - Mivart, St. George Jackson, 1827 -1900 (R.H. Porter, 1892)

Birds: the elements of ornithology ; with 174 illustrations whereof 140 are original drawings - Mivart, St. George Jackson, 1827 -1900 (R.H. Porter, 1892)

Birds: the elements of ornithology ; with 174 illustrations whereof 140 are original drawings - Mivart, St. George Jackson, 1827 -1900 (R.H. Porter, 1892)

Birds: the elements of ornithology ; with 174 illustrations whereof 140 are original drawings - Mivart, St. George Jackson, 1827 -1900 (R.H. Porter, 1892)

Bonner zoologische Monographien (Zoologisches Forschungsinstitut und Museum Alexander Koenig, 2011)

Brehms Tierleben. Allgemeine kunde des Tierreichs - Werner, Franz, 1867 -1939 (Bibliographisches Institut, 1913)

Brehms Tierleben. Allgemeine kunde des Tierreichs - Werner, Franz, 1867 -1939 (Bibliographisches Institut, 1913)

Brehms Tierleben. Allgemeine kunde des Tierreichs - Werner, Franz, 1867 -1939 (Bibliographisches Institut, 1913)

British birds (1985)

British birds (1985)

Bulletin - United States National Museum (G.P.O, 1937)

Bulletin of the African Bird Club - African Bird Club. (African Bird Club, 2000)

Bulletin of the African Bird Club - African Bird Club. (African Bird Club, 2007)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1892)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1972)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1971)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1971)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1971)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1976)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1976)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1978)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1978)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1978)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1978)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1979)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1978)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1978)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1980)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1991)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1991)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1991)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1992)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 2003)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 2003)

Bulletin of the British Ornithologists' Club - British Ornithologists' Club. (British Ornithologists' Club, 1893)

Bulletin of the Museum of Comparative Zoology at Harvard College - Harvard University. Museum of Comparative Zoology. (The Museum, 1960)

Bulletin of the United States National Museum - United States National Museum (G.P.O, 1882)

Bulletin / Oriental Bird Club - Oriental Bird Club. (the Club, 2000)

Bulletin / Oriental Bird Club - Oriental Bird Club. (the Club, 2000)

Bulletin - Peabody Museum of Natural History. (The Museum, 1971)

Bulletin - Peabody Museum of Natural History. (The Museum, 1971)

Bulletin - Peabody Museum of Natural History. (The Museum, 1971)

Bulletin - Peabody Museum of Natural History. (The Museum, 1971)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1899)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1899)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1899)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1900)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1900)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1900)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1900)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1900)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1899)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1899)

The Cambridge natural history - Harmer, S. F. (Sidney Frederic), 1862 -1950 (Macmillan and co., limited, 1899)

Catalogue des collections ornithologiques en vente chez - Bouvier, Aimé. (A. Bouvier, 1874)

Catalogue of the Birds in the British Museum - British Museum (Natural History). Department of Zoology. [Birds]. (1890)

Catalogue of the Birds in the British Museum - British Museum (Natural History). Department of Zoology. [Birds]. (1890)

Catalogue of the Birds in the British Museum - British Museum (Natural History). Department of Zoology. [Birds]. (1890)

Catalogue of the Birds in the British Museum - British Museum (Natural History). Department of Zoology. [Birds]. (1890)

Catalogus avium : hucusque descriptorum - Boucard, Adolphe, 1839 -1905 ([s.n.], 1876)

Check-list of birds of the world - Traylor, Melvin A. (Melvin Alvah), 1915 -2008 (Harvard University Press, 1960)

Check-list of birds of the world - Traylor, Melvin A. (Melvin Alvah), 1915 -2008 (Harvard University Press, 1960)

Check-list of birds of the world - Traylor, Melvin A. (Melvin Alvah), 1915 -2008 (Harvard University Press, 1960)

Check-list of birds of the world - Traylor, Melvin A. (Melvin Alvah), 1915 -2008 (Harvard University Press, 1960)

Check-list of birds of the world - Traylor, Melvin A. (Melvin Alvah), 1915 -2008 (Harvard University Press, 1987)

Check-list of birds of the world - Traylor, Melvin A. (Melvin Alvah), 1915 -2008 (Harvard University Press, 1987)

Checklist of birds listed in the CITES appendices (1995)

Checklist of birds listed in the CITES appendices (1995)

Checklist of birds listed in the CITES appendices (1995)

Checklist of birds listed in the CITES appendices and in EC Regulation 338/97 (2001)

Checklist of birds listed in the CITES appendices and in EC Regulation 338/97 (1999)

Checklist of birds listed in the CITES appendices and in EC Regulation 338/97 (1999)

Checklist of birds listed in the CITES appendices and in EC Regulation 338/97 (2001)

Checklist of birds listed in the CITES appendices and in EC Regulation 338/97 (1999)

Checklist of CITES Species (1998)

Checklist of CITES Species (1998)

Checklist of CITES Species: a reference to the appendices to the Convention on International Trade in Endangered Species of Wild Fauna and Flora (1996)

A classification of Recent birds - Rothschild, Lionel Walter Rothschild, Baron, 1868 -1937 (American Museum of Natural History, 1951)

A classification of Recent birds - Rothschild, Lionel Walter Rothschild, Baron, 1868 -1937 (American Museum of Natural History, 1951)

A classification of Recent birds - Rothschild, Lionel Walter Rothschild, Baron, 1868 -1937 (American Museum of Natural History, 1951)

The classification of the olive warbler, Peucedramus taeniatus - George, William Gordon, 1925 - (American Museum of Natural History, 1962)

A dictionary of birds - Shufeldt, Robert Wilson 1850 -1934 (A. and C. Black, 1893)

A dictionary of birds - Lydekker, Richard, 1849 -1915 (A. and C. Black, 1896)

A dictionary of birds - Lydekker, Richard, 1849 -1915 (A. and C. Black, 1896)

A dictionary of birds - Shufeldt, Robert Wilson 1850 -1934 (A. and C. Black, 1896)

A dictionary of birds - Shufeldt, Robert Wilson 1850 -1934 (A. and C. Black, 1896)

A dictionary of birds - Shufeldt, Robert Wilson 1850 -1934 (A. and C. Black, 1893)

A dictionary of birds - Shufeldt, Robert Wilson 1850 -1934 (A. and C. Black, 1893)

Fieldiana Zoology - Field Museum of Natural History. (Chicago Natural History Museum, 1961)

Fieldiana Zoology - Field Museum of Natural History. (Chicago Natural History Museum, 1961)

Forktail - Oriental Bird Club. (1987)

Forktail - Oriental Bird Club. (1986)

Die Gefiederte Welt (VFV Verbands- und Fachschriftenverlag GmbH & Co. [etc.], 1904)

General index to A hand-list of the genera and species of birds - Sharpe, Richard Bowdler, 1847 -1909 (British Museum (Natural History), 1912)

The geographical distribution of animals : with a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Macmillan and Co, 1876)

The geographical distribution of animals : with a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Macmillan and Co, 1876)

Geographical distribution of animals : with a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Macmillan, 1876)

The geographical distribution of animals : with a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Macmillan and Co, 1876)

The geographical distribution of animals : with a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Macmillan and Co, 1876)

The geographical distribution of animals, with a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Macmillan and Co, 1876)

The geographical distribution of animals, with a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Macmillan and Co, 1876)

The geographical distribution of animals. With a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Harper and brothers, 1876)

The geographical distribution of animals. With a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Harper and brothers, 1876)

The geographical distribution of animals. With a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Harper and brothers, 1876)

The geographical distribution of animals with a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Macmillan, 1876)

The geographical distribution of animals with a study of the relations of living and extinct faunas as elucidating the past changes of the earth's surface - Wallace, Alfred Russel, 1823 -1913 (Macmillan, 1876)

Hand-list of genera and species of birds : distinguishing those contained in the British Museum - Gray, George Robert, 1808 -1872 (printed by order of the Trustees, 1869)

Hand-list of genera and species of birds : distinguishing those contained in the British Museum - Gray, George Robert, 1808 -1872 (printed by order of the Trustees, 1869)

Hand-list of genera and species of birds : distinguishing those contained in the British Museum - Gray, George Robert, 1808 -1872 (printed by order of the Trustees, 1871)

Hand-list of genera and species of birds : distinguishing those contained in the British Museum - Gray, George Robert, 1808 -1872 (printed by order of the Trustees, 1869)

Hand-list of genera and species of birds : distinguishing those contained in the British Museum - Gray, George Robert, 1808 -1872 (printed by order of the Trustees, 1869)

Hand-list of genera and species of birds : distinguishing those contained in the British Museum - Gray, George Robert, 1808 -1872 (printed by order of the Trustees, 1871)

Hand-list of genera and species of birds : distinguishing those contained in the British Museum - Gray, George Robert, 1808 -1872 (printed by order of the Trustees, 1869)

Hand-list of genera and species of birds : distinguishing those contained in the British Museum - Gray, George Robert, 1808 -1872 (printed by order of the Trustees, 1869)

Hand-list of genera and species of birds : distinguishing those contained in the British Museum - Gray, George Robert, 1808 -1872 (printed by order of the Trustees, 1869)

A hand-list of the genera & species of birds. (Nomenclator avium tum fossilium tum viventium) - Sharpe, Richard Bowdler, 1847 -1909 (Printed by order of the Trustees, 1903)

A hand-list of the genera & species of birds. (Nomenclator avium tum fossilium tum viventium) - Sharpe, Richard Bowdler, 1847 -1909 (Printed by order of the Trustees, 1903)

A hand-list of the genera & species of birds. (Nomenclator avium tum fossilium tum viventium) - Sharpe, Richard Bowdler, 1847 -1909 (Printed by order of the Trustees, 1903)

A hand-list of the genera & species of birds. (Nomenclator avium tum fossilium tum viventium) - Sharpe, Richard Bowdler, 1847 -1909 (Printed by order of the Trustees, 1903)

A hand-list of the genera & species of birds. (Nomenclator avium tum fossilium tum viventium) - Sharpe, Richard Bowdler, 1847 -1909 (Printed by order of the Trustees, 1903)

A hand-list of the genera & species of birds. (Nomenclator avium tum fossilium tum viventium) - Sharpe, Richard Bowdler, 1847 -1909 (Printed by order of the Trustees, 1912)

A hand-list of the genera & species of birds. (Nomenclator avium tum fossilium tum viventium) - Sharpe, Richard Bowdler, 1847 -1909 (Printed by order of the Trustees, 1912)

Handbuch der Oologie Lief. 1-47 / v.1-4 - Meise, Wilhelm (Akademie-Verlag, 1988)

Handbuch der zoologie - Carus, Julius Victor, 1823 -1903 (W. Engelmann, 1875)

Handbuch der zoologie - Carus, Julius Victor, 1823 -1903 (W. Engelmann, 1875)

Handbuch der zoologie - Carus, Julius Victor, 1823 -1903 (W. Engelmann, 1868)

Handwörterbuch der naturwissenschaften - Verworn, Max, 1863 -1921 (G. Fischer, 1912)

Handwörterbuch der naturwissenschaften - Verworn, Max, 1863 -1921 (G. Fischer, 1912)

The Humming bird - Boucard, Adolphe, 1839 -1905 (A. Boucard, 1895)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1861)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1861)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1861)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1861)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1861)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1861)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1866)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1866)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1890)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1906)

Ibis - British Ornithologists' Union (Published for the British Ornithologists' Union by Academic Press, 1918)

Index generum avium. A list of the genera and subgenera of birds - Waterhouse, Frederick Herschel, 1845 -1919 (R. H. Porter, 1889)

Index generum avium : a list of the genera and subgenera of birds - Waterhouse, Frederick Herschel, 1845 -1919 (R.H. Porter, 1889)

Index to the genera of birds - McGregor, Richard C. (Richard Crittenden), 1871 -1936 (Bureau of Printing, 1920)

Journal für Ornithologie - Deutsche Ornithologen-Gesellschaft (Friedländer, 1861)

Journal für Ornithologie - Deutsche Ornithologen-Gesellschaft (Friedländer, 1861)

Journal für Ornithologie - Deutsche Ornithologen-Gesellschaft (Friedländer, 1853)

Malimbus : journal of the West African Ornithological Society - West African Ornithological Society. (Ahmadu Bello University Press, 1993)

Malimbus : journal of the West African Ornithological Society - West African Ornithological Society. (Ahmadu Bello University Press, 2012)

Museum Heineanum : Verzeichniss der ornithologischen Sammlung des Oberamtmann Ferdinand Heine, auf Gut St. Burchard vor Halberstadt - Cabanis, Jean Louis, 1816 -1906 (In Commission bei R. Frantz, 1862)

Natural history - Bernard, Henry Meyners, 1853 -1909 (D. Appleton and company, 1897)

Natural history - Bernard, Henry Meyners, 1853 -1909 (D. Appleton and company, 1897)

Natural history - Lydekker, Richard, 1849 -1915 (Hutchinson, 1897)

Nomenclator zoologicus continens nomina systematica generum animalium tam viventium quam fossilium, secundum ordinem alphabeticum disposita, sub auspiciis et sumptibus C. R. Societatis zoologico-botanicae conscriptus a comite Augusto de Marschall - Marschall, August Friedrich, 1804 -1887 (typis C. Ueberreuter (M. Salzer), 1873)

L'Oiseau et la Revue francaise d'ornithologie - Société ornithologique de France. (Société ornithologique de France, 1938)

L'Oiseau et la Revue francaise d'ornithologie - Société ornithologique de France. (Société ornithologique de France, 1938)

L'Oiseau et la Revue francaise d'ornithologie - Société ornithologique de France. (Société ornithologique de France, 1981)

Ornithological miscellany - Mintern Bros., (Trübner and Co., Bernard Quaritch, R.H. Porter, 1878)

Ornithological miscellany - Mintern Bros., (Trübner and Co., Bernard Quaritch, R.H. Porter, 1878)

Remarques sur l'ornithologie de l'État indépendant du Congo : suivies d'une liste des espèces recueillies jusqu'ici dans cet état - Dubois, Alphonse, 1839 -1921. ([s.n, 1905)

Remarques sur l'ornithologie de l'État indépendant du Congo : suivies d'une liste des espèces recueillies jusqu'ici dans cet état - Dubois, Alphonse, 1839 -1921. ([s.n, 1905)

Remarques sur l'ornithologie de l'État indépendant du Congo : suivies d'une liste des espèces recueillies jusqu'ici dans cet état - Dubois, Alphonse, 1839 -1921. ([s.n, 1905)

Revue zoologique africaine (Hayez, 1922)

Revue zoologique africaine (Hayez, 1922)

Revue zoologique africaine (Hayez, 1922)

Revue zoologique africaine (Hayez, 1922)

Revue zoologique africaine (Hayez, 1922)

Revue zoologique africaine (Hayez, 1922)

Revue zoologique africaine (Hayez, 1922)

Synopsis avium : nouveau manuel d'ornithologie - Dubois, Alphonse, 1839 -1921. (H. Lamertin, 1902)

Synopsis avium : nouveau manuel d'ornithologie - Dubois, Alphonse, 1839 -1921. (H. Lamertin, 1904)

Synopsis avium : nouveau manuel d'ornithologie - Dubois, Alphonse, 1839 -1921. (H. Lamertin, 1904)

Thesaurus ornithologiae : Repertorium der gesammten ornithologischen Literatur und Nomenclator sämmtlicher Gattungen und Arten der Vögel, nebst Synonymen und geographischer Verbreitung - Giebel, C. (Christoph), 1820 -1881 (Brockhaus, 1877)

Tierleben : allgemeine Kunde des Tierreichs - Brehm, Alfred Edmund, 1829 -1884 (Bibliographisches Institut, 1911)

Tierleben : allgemeine Kunde des Tierreichs - Brehm, Alfred Edmund, 1829 -1884 (Bibliographisches Institut, 1911)

Tierleben : allgemeine Kunde des Tierreichs - Brehm, Alfred Edmund, 1829 -1884 (Bibliographisches Institut, 1911)

Tierleben : allgemeine Kunde des Tierreichs - Brehm, Alfred Edmund, 1829 -1884 (Bibliographisches Institut, 1911)

Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien - Zoologisch-Botanische Gesellschaft in Wien. (Kaiserlich-Königliche Zoologisch-Botanische Gesellschaft in Wien, 1875)

Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien - Zoologisch-Botanische Gesellschaft in Wien. (Kaiserlich-Königliche Zoologisch-Botanische Gesellschaft in Wien, 1875)

Die Vögel; Handbuch der systematischen Ornithologie - Reichenow, Anton, 1847 -1941 (F. Enke, 1914)

Die Vögel; Handbuch der systematischen Ornithologie - Reichenow, Anton, 1847 -1941 (F. Enke, 1914)

Die Vögel; Handbuch der systematischen Ornithologie - Reichenow, Anton, 1847 -1941 (F. Enke, 1914)

Die Vögel Afrikas - Reichenow, Anton, 1847 -1941 (J. Neumann, 1900)

Die Vögel Afrikas - Reichenow, Anton, 1847 -1941 (J. Neumann, 1900)

Die Vögel Afrikas - Reichenow, Anton, 1847 -1941 (J. Neumann, 1900)

Die Vögel Afrikas - Reichenow, Anton, 1847 -1941 (J. Neumann, 1903)

Die Vögel Afrikas - Reichenow, Anton, 1847 -1941 (J. Neumann, 1903)

Die Vogel Ost-Afrikas. Baron Carl Claus von Deer Decken's Reisen in Ost-Africa. Bd. 4 - Hartlaub, Gustav, 1814 -1900 (C.F. Winter'sche Verlagshandlung, 1870)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1973)

World Checklist of Threatened Birds (1993)

World Checklist of Threatened Birds (1990)

World Checklist of Threatened Birds (1990)

World Checklist of Threatened Birds (1993)

The Zoological record - Zoological Society of London. (J.V. Voorst, 1890)

Zoologische Jahrbücher Abteilung für Systematik, Geographie und Biologie der Tiere (G. Fischer, 1888)

Zoologische Jahrbücher Abteilung für Systematik, Geographie und Biologie der Tiere (G. Fischer, 1888)