APA (7th ed.) Citation

Göpel, E., & Blum, K. (1957). Max Beckmann, der Maler. Piper.

Chicago Style (17th ed.) Citation

Göpel, Erhard, and Kurt Blum. Max Beckmann, Der Maler. München: Piper, 1957.

MLA (9th ed.) Citation

Göpel, Erhard, and Kurt Blum. Max Beckmann, Der Maler. Piper, 1957.

Warning: These citations may not always be 100% accurate.