Cita APA (7a ed.)

Westerman, R. L. (1990). Soil testing and plant analysis (3rd. ed.). Soil Science Society of America.

Cita Chicago Style (17a ed.)

Westerman, R. L. Soil Testing and Plant Analysis. 3rd. ed. Madison: Soil Science Society of America, 1990.

Cita MLA (8a ed.)

Westerman, R. L. Soil Testing and Plant Analysis. 3rd. ed. Soil Science Society of America, 1990.