APA (7th ed.) Citation

Knopp, G., Adler, P., & Dreier, B. (1996). Hitlers Helfer. Bertelsmann.

Chicago Style (17th ed.) Citation

Knopp, Guido, Peter Adler, and Bettina Dreier. Hitlers Helfer. München: Bertelsmann, 1996.

MLA (8th ed.) Citation

Knopp, Guido, et al. Hitlers Helfer. Bertelsmann, 1996.