APA (7th ed.) Citation

Gregersen, E. A. (1977). Language in Africa: An introductory survey. Gordon and Breach.

Chicago Style (17th ed.) Citation

Gregersen, Edgar A. Language in Africa: An Introductory Survey. New York [u.a.]: Gordon and Breach, 1977.

MLA (9th ed.) Citation

Gregersen, Edgar A. Language in Africa: An Introductory Survey. Gordon and Breach, 1977.