APA (7th ed.) Citation

Otto, B., Kretschmann, J., & Frommberger, H. (1959). Was sagt Berthold Otto? Crüwell.

Chicago Style (17th ed.) Citation

Otto, Berthold, Johannes Kretschmann, and Herbert Frommberger. Was Sagt Berthold Otto? Dortmund: Crüwell, 1959.

MLA (9th ed.) Citation

Otto, Berthold, et al. Was Sagt Berthold Otto? Crüwell, 1959.