Le parlers du Khoisan central. In Guarisma, Gladys and Wilhelm J. G. Möhlig (eds.), La methode dialectometrique appliquée aux langues africaines, 395-431. Berlin: Dietrich Reimer Verlag.; Haacke, W., E. Eiseb, & L. Namaseb. 1997. Internal and external relations of Khoe-Khoe dialects: A preliminary survey. In Haacke, E.H.G. & E.E. Elderkin (eds.), Namibian languages: Reports and papers. Köln: Rüdiger Köppe Verlag.; Sands, B.E. 1995. Evaluating claims of distant linguistic relationship: The Case of Khoisan. MS, UCLA.