APA (7th ed.) Citation

Helbig, G. (1971). Beitrage zur Valenztheorie. Mouton.

Chicago Style (17th ed.) Citation

Helbig, Gerhard. Beitrage Zur Valenztheorie. The Hague: Mouton, 1971.

MLA (8th ed.) Citation

Helbig, Gerhard. Beitrage Zur Valenztheorie. Mouton, 1971.

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