Aloes of Zimbabwe: by Oliver West, 1992

Caudiciform and Pachycaul Succulents: by Gorden D. Rowley, 1987

Choice Mammillarias: by Brian Fearn & Leslie Pearcy, 1986

Coryphantha and Associated Genera: by Ian Lawrie, 1988

Didiereaceae- "Cacti of the Old World": by Gorden D. Rowley, 1992

Fine Flowered Cacti- "Epiphyllums": by F.R. McQuown, 1965

First Fifty Haworthias, The: by John Pilbeam, 1970 + 1977

Gasterias of South Africa: by E.J. Van Jaarsveld, 1994

Genus Conophytum, The: by Steven Hammer, 1993

Genus Echinocereus, The: by Nigel P. Taylor, 1985

Growing the Mesembs, (The New): by Ed Storm, 1986

Guide to the Aloes of South Africa: by Ben-Erik van Wyk & Gideon

Smith, 1996

Mesembs of the World: by Gideon F. Smith, Pascale Chesselet, Ernst J.

Klak, & Hubert Kurzweil.

Pelargoniums by Diana Miller, 1996

Plant Jewels of the High Country "Sempervivums and Sedums": by

Helen E. Payne

Second Fifty Haworthias, The: by John Pilbeam, 1975

Succulent and Xerophytic Plants of Madagascar, Vol.I: by Werner Rauh, 1995

Succulent and Xerophytic Plants of Madagascar, Vol.II: by Werner Rauh, 1998

Succulent Flora of Southern Africa: by Doreen Court, 2000

Vygies: Gems of the Veld: by Ernst J. van Jaarsveld & U. deVilliers