APA (7th ed.) Citation

Ruchatz, P., Vorbrodt, W., & Geist, G. (1930). Lebenskunde. Zickfeldt.

Chicago Style (17th ed.) Citation

Ruchatz, Paul, Walther Vorbrodt, and Gustav Geist. Lebenskunde. Osterwieck am Harz: Zickfeldt, 1930.

MLA (9th ed.) Citation

Ruchatz, Paul, et al. Lebenskunde. Zickfeldt, 1930.