Kisuba (Kenya)
Rottland, Franz; Okoth-Okombo, Duncan. 1992. Language shift among the Suba of Kenya. Katika: Language death: factual and theoretical explorations with special reference to East Africa (Contributions to the sociology of language, vol 64), uk.273-283. Kuhaririwa na Matthias Brenzinger. Berlin & New York: Mouton de Gruyter.