APA (7th ed.) Citation

Christmann, U., & Groeben, N. (1999). Psychologie des Lesens. Handbuch Lesen.

Chicago Style (17th ed.) Citation

Christmann, Ursula, and Norbert Groeben. "Psychologie Des Lesens." Handbuch Lesen 1999.

MLA (9th ed.) Citation

Christmann, Ursula, and Norbert Groeben. "Psychologie Des Lesens." Handbuch Lesen, 1999.

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