APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Soil Science Society of America and Robert Lee Westerman. Soil Testing and Plant Analysis. 3rd ed. Madison, Wis., USA: Soil Science Society of America, 1990.

MLA (9th ed.) Citation

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