APA (7th ed.) Citation

Wendt, A., & Friedman, M. (2008). Christian Achenbach.

Chicago Style (17th ed.) Citation

Wendt, Andreas, and Mario Friedman. Christian Achenbach. Berlin, 2008.

MLA (8th ed.) Citation

Wendt, Andreas, and Mario Friedman. Christian Achenbach. 2008.

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