APA (7th ed.) Citation

Mathar, L., & Key, W. (1931). Jerritje wird Student: Ludwig Mathar. [Ill.: Willy Key]. Bachem.

Chicago Style (17th ed.) Citation

Mathar, Ludwig, and Willy Key. Jerritje Wird Student: Ludwig Mathar. [Ill.: Willy Key]. Köln: Bachem, 1931.

MLA (8th ed.) Citation

Mathar, Ludwig, and Willy Key. Jerritje Wird Student: Ludwig Mathar. [Ill.: Willy Key]. Bachem, 1931.

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