Cita APA (7a ed.)

STEVENSON, F. Humus chemistry genesis, composition, reactions. New York.

Cita Chicago Style (17a ed.)

STEVENSON, F.J. Humus Chemistry Genesis, Composition, Reactions. New York.

Cita MLA (8a ed.)

STEVENSON, F.J. Humus Chemistry Genesis, Composition, Reactions. New York.