APA (7th ed.) Citation

Zumkley, H. (1978). Aggression und Katharsis. Hogrefe.

Chicago Style (17th ed.) Citation

Zumkley, Horst. Aggression Und Katharsis. Göttingen: Hogrefe, 1978.

MLA (9th ed.) Citation

Zumkley, Horst. Aggression Und Katharsis. Hogrefe, 1978.

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