APA (7th ed.) Citation

Düerkop, B., & Nowald, K. (1997). ...Die Kraft der Farbe.

Chicago Style (17th ed.) Citation

Düerkop, Bert, and Karlheinz Nowald. ...Die Kraft Der Farbe. [Hamburg], 1997.

MLA (8th ed.) Citation

Düerkop, Bert, and Karlheinz Nowald. ...Die Kraft Der Farbe. 1997.

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