Voßen, Rainer. 1997. Die Khoe-Sprachen. (Quellen zur Khoisan-Forschung.) Cologne: Köppe.
@book{vossen1997, address = {Cologne}, author = {Voßen, Rainer}, number = {12}, publisher = {Köppe}, series = {Quellen zur Khoisan-Forschung}, title = {Die Khoe-Sprachen}, year = {1997} }