Catalog of hymenoptera in America north of Mexico - Krombein, Karl V. (Smithsonian Institution Press, 1979)

Catalogo de las Abejas de Mexico - Cockerell, Theodore D. A. (Theodore Dru Alison), 1866 -1948 (Ofic. tip. de la Secretaria de Fomento, 1899)

Catalogue of British fossorial Hymenoptera, Formicidæ, and Vespidæ, in the collection of the British museum - British Museum (Natural History). Department of Zoology. (Printed by order of the Trustees, 1858)

Catalogue of British Hymenoptera in the British museum - British Museum (Natural History). Department of Zoology. (Printed by the order of the Trustees, 1876)

Catalogue of British Hymenoptera in the British Museum. Part 1, Andrenidae and Apidae - British Museum (Natural History). Department of Zoology. (Printed by order of the Trustees, 1891)

Catalogue of British Hymenoptera in the collection of the British Museum Part I Apidae - Bees - British Museum (Natural History) (1855)

Catalogue of hymenopterous insects in the collection of the British museum... - British Museum (Natural History). Department of Zoology. (Printed by order of the Trustees, 1853)

Catalogue of hymenopterous insects in the collection of the British museum... - British Museum (Natural History). Department of Zoology. (Printed by order of the Trustees, 1854)