Ittmann, Johannes. 1939. Grammatik des Duala. Berlin: Reimer.
@book{Ittmann-1939, address = {Berlin}, author = {Ittmann, Johannes}, publisher = {Reimer}, title = {Grammatik des Duala}, year = {1939}, iso_code = {dua}, olac_field = {typology; syntax; general_linguistics}, wals_code = {dua} }