APA (7th ed.) Citation

(1972). Thema Umweltschutz. Beltz.

Chicago Style (17th ed.) Citation

Thema Umweltschutz. Weinheim: Beltz, 1972.

MLA (9th ed.) Citation

Thema Umweltschutz. Beltz, 1972.

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