APA (7th ed.) Citation

Simenon, G., & Wille, H. (1968). Der Witwer. Kiepenheuer & Witsch.

Chicago Style (17th ed.) Citation

Simenon, Georges, and Hansjürgen Wille. Der Witwer. Köln ; Berlin: Kiepenheuer & Witsch, 1968.

MLA (9th ed.) Citation

Simenon, Georges, and Hansjürgen Wille. Der Witwer. Kiepenheuer & Witsch, 1968.

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