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Peter Behrens, Libya Antiqua: Report and Papers of the Symposium Organized by Unesco in Paris, 16 to 18 January 1984: "Language and migrations of the early Saharan cattle herders: the formation of the Berber branch", Unesco, (ISBN92-3-102376-4, lire en ligne), p. 30.
Roger Blench, Kevin MacDonald (ed.) Marianne Bechaus-Gerst, The Origins and Development of African Livestock: Archaeology, Genetics, Linguistics and Ethnography: "Linguistic evidence for the prehistory of livestock in Sudan" (2000), Routledge, , 568 p. (ISBN978-1-135-43416-8 et 1-135-43416-6, lire en ligne), p. 453.