APA (7th ed.) Citation

Sonntag, C., & Rettich, M. (1963). Pipsi / Ill. von Margret Rettich. Thienemann.

Chicago Style (17th ed.) Citation

Sonntag, Charlotte, and Margret Rettich. Pipsi / Ill. Von Margret Rettich. Stuttgart: Thienemann, 1963.

MLA (8th ed.) Citation

Sonntag, Charlotte, and Margret Rettich. Pipsi / Ill. Von Margret Rettich. Thienemann, 1963.

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