APA (7th ed.) Citation

Richter, H. P., & Kroll, E. (1987). Friedrich. Puffin Books.

Chicago Style (17th ed.) Citation

Richter, Hans Peter, and Edite Kroll. Friedrich. Harmondsworth: Puffin Books, 1987.

MLA (8th ed.) Citation

Richter, Hans Peter, and Edite Kroll. Friedrich. Puffin Books, 1987.

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