APA (7th ed.) Citation

Steinbeck, D., Eberle, G., & Ohff, H. (1991). Berliner Forum.

Chicago Style (17th ed.) Citation

Steinbeck, Dietrich, Gottfried Eberle, and Heinz Ohff. Berliner Forum. Berlin, 1991.

MLA (8th ed.) Citation

Steinbeck, Dietrich, et al. Berliner Forum. 1991.