Style de citation APA (7e éd.)

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

Style de citation Chicago (17e éd.)

Gregersen, Edgar A.., et Anthony L. LaRuffa. Language in Africa: An Introductory Survey. New York ; Paris ; London: Gordon and Breach, 1977.

Style de citation MLA (9e éd.)

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