APA (7th ed.) Citation

Wallis, B. M. (1978). Diedrich Westermann's Die westlichen Sudansprachen and the clasification of the languages of West Africa. [publisher not identified].

Chicago Style (17th ed.) Citation

Wallis, Barry Michael. Diedrich Westermann's Die Westlichen Sudansprachen and the Clasification of the Languages of West Africa. [Place of publication not identified]: [publisher not identified], 1978.

MLA (9th ed.) Citation

Wallis, Barry Michael. Diedrich Westermann's Die Westlichen Sudansprachen and the Clasification of the Languages of West Africa. [publisher not identified], 1978.