Schadeberg, Thilo C. 1990. A Sketch of Umbundu. (Grammatische Analysen afrikanischer Sprachen, 1.) Köln: Köppe Verlag.
@book{Schadeberg-1990, address = {Köln}, author = {Schadeberg, Thilo C.}, publisher = {Köppe Verlag}, series = {Grammatische Analysen afrikanischer Sprachen}, title = {A Sketch of Umbundu}, volume = {1}, year = {1990}, iso_code = {umb}, olac_field = {typology; general_linguistics; phonology; phonetics}, wals_code = {umb} }