APA (7th ed.) Citation

Bley, H. (1990). Sklaverei in Afrika.

Chicago Style (17th ed.) Citation

Bley, Helmut. Sklaverei in Afrika. Pfaffenweiler, 1990.

MLA (9th ed.) Citation

Bley, Helmut. Sklaverei in Afrika. 1990.

Warning: These citations may not always be 100% accurate.