APA (7th ed.) Citation

Metzger, W. (1966). Allgemeine Psychologie. Allgemeine Psychologie.

Chicago Style (17th ed.) Citation

Metzger, Wolfgang. "Allgemeine Psychologie." Allgemeine Psychologie 1966.

MLA (9th ed.) Citation

Metzger, Wolfgang. "Allgemeine Psychologie." Allgemeine Psychologie, 1966.

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