de Kock, K., and C. Wolmarans. “Distribution and Habitats of Unio Caffer Krauss, 1848 (Bivalvia: Unionoida: Unionidae) in South Africa Based on the Records in the Database of the National Freshwater Snail Collection”. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt;, Vol. 29, no. 4, Jan. 2010, pp. 173-85, doi:10.4102/satnt.v29i4.21.