Venter, A. M. (2000). Taxonomy of the genus Lycium L.(Solanaceae) in Africa. 2000. Thèse de doctorat. University of the Free State.
Venter, A. M. (2000). Taxonomy of the genus Lycium L.(Solanaceae) in Africa. 2000. Thèse de doctorat. University of the Free State.