Lugha za Khoisan
Traill, Anthony. 1986. "Do the Khoi have a place in the San? New data on Khoisan linguistic relationships." In African Hunter-gatherers (International Symposium), Franz Rottland and Rainer Vossen, 407-430. Sprache und Geschichte in Afrika, special issue 7.1. Hamburg: Helmut Buske Verlag.