1. Medicinal and magical plants of Southern Africa: an annotated checklist;Arnold,2002
2. Wild Flowers of the Eastern Cape Province;Batten,1966
3. World geographical scheme for recording plant distributions;Brummit,2001
4. Zulu Medicine and Medicine-men;Bryant,1966
5. Vanillin: more than a flavouring agent — a potent antioxidant;Burri;Journal of the Science of Food and Agriculture,1989