APA (7th ed.) Citation

Christoffer, S. (2012). 20. Jahrhundert. Klett.

Chicago Style (17th ed.) Citation

Christoffer, Sven. 20. Jahrhundert. Stuttgart: Klett, 2012.

MLA (9th ed.) Citation

Christoffer, Sven. 20. Jahrhundert. Klett, 2012.

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