APA (7th ed.) Citation

Sonntag, C., & Heyden, U. v. d. (1999). Mein Freund Maleboch. Cognoscere.

Chicago Style (17th ed.) Citation

Sonntag, Christoph, and Ulrich van der Heyden. "Mein Freund Maleboch." Cognoscere 1999.

MLA (9th ed.) Citation

Sonntag, Christoph, and Ulrich van der Heyden. "Mein Freund Maleboch." Cognoscere, 1999.

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