APA (7th ed.) Citation

Frieling, E., & Sonntag, K. (1987). Lehrbuch Arbeitspsychologie. Huber.

Chicago Style (17th ed.) Citation

Frieling, Ekkehart, and Karlheinz Sonntag. Lehrbuch Arbeitspsychologie. Bern Stuttgart Toronto: Huber, 1987.

MLA (9th ed.) Citation

Frieling, Ekkehart, and Karlheinz Sonntag. Lehrbuch Arbeitspsychologie. Huber, 1987.

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