APA (7th ed.) Citation

Franzen, H. (1973). Let's learn English. Crüwell.

Chicago Style (17th ed.) Citation

Franzen, Hans. Let's Learn English. Dortmund: Crüwell, 1973.

MLA (9th ed.) Citation

Franzen, Hans. Let's Learn English. Crüwell, 1973.

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