Blumen-Zeitung - Hässler, Friedrich. (G. F. Grossmann [etc.], 1828)

Botanische Zeitung - Mohl, Hugo von, 1805 -1872 (A. Förstner, 1848)

Botanische Zeitung - Mohl, Hugo von, 1805 -1872 (A. Förstner, 1848)

Carnivorous plant newsletter - California State University, Fullerton. Arboretum. (International Carnivorous Plant Society, etc, 2014)

Checklist of CITES Species and Annotated CITES Appendices and Reservations - Inskipp, Tim (CITES Secretariat, UNEP-WCMC, 2005)

Checklist of CITES Species: a reference to the appendices to the Convention on International Trade in Endangered Species of Wild Fauna and Flora (2001)

Checklist of CITES Species: a reference to the appendices to the Convention on International Trade in Endangered Species of Wild Fauna and Flora (2003)

Checklist of CITES Species: a reference to the appendices to the Convention on International Trade in Endangered Species of Wild Fauna and Flora (2001)

The Gardens' bulletin, Singapore (Govt. Print. Off. [etc.], 2009)

The Gardens' bulletin, Singapore (Govt. Print. Off. [etc.], 2009)

The Gardens' bulletin, Singapore (Govt. Print. Off. [etc.], 2009)

Jahres-Bericht der Schlesischen Gesellschaft für Vaterländische Cultur - Herrick, Francis Hobart, 1858 -1940 (G.P. Aderholz, 1858)

Revue horticole (Librairie agricole de la maison rustique, 1869)