Ninu iyasoto àwọn èdè Áfríkà, awon ede Volta-Niger tàbí Ìwọòrùn Bẹ́núé-Kóngò tàbí Ìlàòrùn Kwa lopojulo ninu awon ede ibatan Atlántíkì-Kóngò, pelu awon sistemu ikosoto oro-oruko to wopo ninu awon ede àwọn èdè Atlántíkì-Kóngò. Wolf, Paul Polydoor de (1971) The Noun Class System of Proto-Benue–Congo (Thesis, Leiden University). The Hague/Paris: Mouton. Williamson, Kay (1989) 'Benue–Congo Overview', pp. 248–274 in Bendor-Samuel, John & Rhonda L. Hartell (eds.) The Niger–Congo Languages — A classification and description of Africa's largest language family. Lanham, Maryland: University Press of America.