APA (7th ed.) Citation

Friedl, H. (1973). Warum? Weshalb? Wieso?

Chicago Style (17th ed.) Citation

Friedl, Hans. Warum? Weshalb? Wieso? 1973.

MLA (9th ed.) Citation

Friedl, Hans. Warum? Weshalb? Wieso? 1973.

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