APA (7th ed.) Citation

Hänninen, K. (1987). Phenolic acids in humus chemistry.

Chicago Style (17th ed.) Citation

Hänninen, Kari. Phenolic Acids in Humus Chemistry. Helsinki, 1987.

MLA (9th ed.) Citation

Hänninen, Kari. Phenolic Acids in Humus Chemistry. 1987.

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