APA (7th ed.) Citation

Ritter, H., & Geitel, K. (1991). Berliner Forum.

Chicago Style (17th ed.) Citation

Ritter, Heinz, and Klaus Geitel. Berliner Forum. Berlin, 1991.

MLA (8th ed.) Citation

Ritter, Heinz, and Klaus Geitel. Berliner Forum. 1991.

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