References
- Annecke, D. P., Karny, M. and Burger, W. A. (1969). Improved biological control of the prickly pear, Opuntia megacantha Salm-Dyck, in South Africa through the use of an insecticide. Phytophylactica 1, 9–13.
- Greathead, D. J. (1971). A review of biological control in the Ethiopian Region. Tech. Commun. Commonw. Inst. biol. Contr., No. 5, 162 pp.