APA (7th ed.) Citation

Museum Folkwang Essen, Eskildsen, U., & Appel-Heyne, O. M. (1978). Heinrich Kühn, 1866-1944. Der Museum.

Chicago Style (17th ed.) Citation

Museum Folkwang Essen, Ute Eskildsen, and Odette M. Appel-Heyne. Heinrich Kühn, 1866-1944. Essen: Der Museum, 1978.

MLA (9th ed.) Citation

Museum Folkwang Essen, et al. Heinrich Kühn, 1866-1944. Der Museum, 1978.