APA (7th ed.) Citation

Lankheit, K., Marc, F., & Marc, M. (1950). Franz Marc. Lemmer.

Chicago Style (17th ed.) Citation

Lankheit, Klaus, Franz Marc, and Maria Marc. Franz Marc. Berlin: Lemmer, 1950.

MLA (9th ed.) Citation

Lankheit, Klaus, et al. Franz Marc. Lemmer, 1950.