APA (7th ed.) Citation

Opel, G. v., & Opel, I. v. (1940). 5000 Kilometer Afrika. Holle.

Chicago Style (17th ed.) Citation

Opel, Georg von, and Irmgard von Opel. 5000 Kilometer Afrika. Berlin: Holle, 1940.

MLA (9th ed.) Citation

Opel, Georg von, and Irmgard von Opel. 5000 Kilometer Afrika. Holle, 1940.