Mann, Michael and David Dalby. A Thesaurus of African Languages: a Classified and Annotated Inventory of the Spoken Languages of Africa. New York: Hans Zell Publishers for the International African Institute, 1987.

Mann, Michael and David Dalby. A Thesaurus of African Languages: a Classified and Annotated Inventory of the Spoken Languages of Africa. New York: Hans Zell Publishers for the International African Institute, 1987.