Cita APA (7a ed.)

Tompkins, P. (1989). Secrets of the soil. Harper & Row.

Cita Chicago Style (17a ed.)

Tompkins, Peter. Secrets of the Soil. New York: Harper & Row, 1989.

Cita MLA (9a ed.)

Tompkins, Peter. Secrets of the Soil. Harper & Row, 1989.