ナイル・サハラ語族
Joseph Greenberg, 1963. The Languages of Africa (International Journal of American Linguistics 29.1). Bloomington, IN: Indiana University Press.
Edgar Gregersen. "Kongo-Saharan". Journal of African Languages, 11, 1:69-89. 1972.
Roger Blench. "Is Niger-Congo simply a branch of Nilo-Saharan?", in ed. Nicolai & Rottland, Fifth Nilo-Saharan Linguistics Colloquium. Nice, 24-29 August 1992. Proceedings. (Nilo-Saharan 10). Koeln: Koeppe Verlag. 1995. pp.36-49.
Lionel Bender, 1997. The Nilo-Saharan Languages: A Comparative Essay. München.
Christopher Ehret, 2001. A Historical-Comparative Reconstruction of Nilo-Saharan. Köln.