MLA

De Wolf, Paul Polydoor. The Noun Class System of Proto-benue-congo. The Hague: Mouton, 1971.

APA

De Wolf, P. Polydoor. (1971). The noun class system of Proto-Benue-Congo. The Hague: Mouton.

Chicago

De Wolf, Paul Polydoor The Noun Class System of Proto-Benue-Congo. The Hague: Mouton, 1971.