APA (7th ed.) Citation

Richter, H. P. (1993). Friedrich (6. print.). Puffin Books.

Chicago Style (17th ed.) Citation

Richter, Hans Peter. Friedrich. 6. print. New York, NY: Puffin Books, 1993.

MLA (9th ed.) Citation

Richter, Hans Peter. Friedrich. 6. print. Puffin Books, 1993.

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