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Conophytum
- Hammer, S. 1993. The Genus Conophytum. Succulent Plant Publications, Pretoria.
- Hammer, S. 2002. Dumpling & his wife: New Views of the Genus Conophytum. EAE Creative Colour Limited.
Lithops
- Cole D.T. & Cole N.A. 2005. Lithops: Flowering Stones. Cactus & Co., Italy.
- Hammer, S. 1999. Lithops Treasures of the Veld. British Cactus and Succulent Society.
Mesembs - General
- Burgoyne, P., Chesselet, P., Hammer, S., Klak, C., Kurzweil, H., Hartmann, H.,Smith, G., van Jaarsveld, E., van Wyk, B. 1998. Mesembs of the World. Briza, Pretoria.
- Herre, H. The Genera of the Mesembryanthemaceae. 1971. Tafelberg-Uitgewers Beperk, Capetown.
- Schwantes D.R. 1957. Flowering Stones & Mid-day Flowers. Ernest Benn Limited.
- Van Jaarsveld, E.V. & U.dV. Pienaar. 2000. Vygies – Gems of the Veld. Cactus & Co., Italy.
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