Stevenson, F. J. (1982). Humus chemistry: Genesis, composition, reactions. John Wiley and Sons.
Cita Chicago (17th ed.)Stevenson, F. J. Humus Chemistry: Genesis, Composition, Reactions. New York: John Wiley and Sons, 1982.
Cita MLA (9th ed.)Stevenson, F. J. Humus Chemistry: Genesis, Composition, Reactions. John Wiley and Sons, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.