APA (7th ed.) Citation

Horn, F. W., & Zimmermann, R. (2009). Einführung.

Chicago Style (17th ed.) Citation

Horn, Friedrich Wilhelm, and Ruben Zimmermann. Einführung. 2009.

MLA (9th ed.) Citation

Horn, Friedrich Wilhelm, and Ruben Zimmermann. Einführung. 2009.

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