Cita APA (7a ed.)

Westerman, R. L. (1990). Soil testing and plant analysis. Soil Science Society of America.

Cita Chicago Style (17a ed.)

Westerman, Robert Lee. Soil Testing and Plant Analysis. Madison, WI: Soil Science Society of America, 1990.

Cita MLA (8a ed.)

Westerman, Robert Lee. Soil Testing and Plant Analysis. Soil Science Society of America, 1990.