APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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