Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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