Cole (Desmond T.) LITHOPS: Flowering stones. Randburg, Acorn Books, 1988 Volume 1457 of the Subscribers edition numbered 101-2400
Craib (Charles) GEOPHYTIC PELARGONIUMS. Pretoria, Umdaus Press, 2001 No 976 of the Standard Edition numbered 26 -1 000
Hammer (Steven A.) THE GENUS CONOPHYTUM: a conograph. Pretoria, Succulent Plant Publications, 1993. No 1934 of the Standard Edition
Van Jaarsveld (Ernst) and Koutnik (Daryl) COTYLEDON AND TYLECODON. Pretoria, Umdaus Press, 2004
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