1. Steyn DG: The toxicology of plants in South Africa. 1934, Central News Agency, South Africa, 23-31.
2. Verdcourt B, Trump EC: Common poisonous plants of East Africa. 1969, Collins, London, 4-6.
3. Neuwinger HD: African Ethnobotany: Poisons and Drugs: Chemistry, Pharmacology and Toxicology. 1996, Chapman and Hall, Germany, 34-37.
4. Van Wyk B, Van Heerden F, Van Oudtshoon B: Poisonous plants of South Africa. 2002, Briza Publications, Pretoria, 46-49.
5. Kellerman TS, Coetzer JAW, Naude TW: Plant poisonings and mycotoxicoses of livestock in Southern Africa. 1988, Oxford University Press, Cape Town, 25-26.