1997 IUCN red list of threatened plants (1997)

Acta Botánica Mexicana - Instituto de Ecología, A C. (Instituto de Ecología, A C, 1997)

Annotated CITES Appendices and Reservations (1998)

Annotated CITES Appendices and Reservations (2001)

Annotated CITES appendices and reservations 1988 (1988)

Biodiversitas - Comisión Nacional para el Conocimiento y Uso de la Biodiversidad (CONABIO) (Comisión Nacional para el Conocimiento y Uso de la Biodiversidad, (CONABIO), 2002)

Biodiversitas - Comisión Nacional para el Conocimiento y Uso de la Biodiversidad (CONABIO) (Comisión Nacional para el Conocimiento y Uso de la Biodiversidad, (CONABIO), 2002)

The botanic gardens list of rare and threatened species (1984)

Checklist of CITES Species (1998)

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)

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

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)

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

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)

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

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

Succulent plants in trade from the wild: analysis of conservation status and international trade - Gillett, Harriet J. (UK Dept of the Environment, Transport and Regions, 1999)

Succulent plants in trade from the wild: analysis of conservation status and international trade - Gillett, Harriet J. (UK Dept of the Environment, Transport and Regions, 1999)