APA (7th ed.) Citation

Frey, K. (1982). Die Projektmethode. Beltz.

Chicago Style (17th ed.) Citation

Frey, Karl. Die Projektmethode. Weinheim u.a: Beltz, 1982.

MLA (9th ed.) Citation

Frey, Karl. Die Projektmethode. Beltz, 1982.

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