APA (7th ed.) Citation

Gerdes, H., Gerdes, I., & Schmidt-Brümmer, H. (1976). San Francisco. DuMont Schauberg.

Chicago Style (17th ed.) Citation

Gerdes, Hartmut, Ingeborg Gerdes, and Horst Schmidt-Brümmer. San Francisco. Köln: DuMont Schauberg, 1976.

MLA (9th ed.) Citation

Gerdes, Hartmut, et al. San Francisco. DuMont Schauberg, 1976.