APA (7th ed.) Citation

Harpstead, M. I., Hole, F. D., & Bennett, W. F. (1988). Soil science simplified (2nd ed.). Iowa State University Press.

Chicago Style (17th ed.) Citation

Harpstead, Milo I., Francis Doan Hole, and William F. Bennett. Soil Science Simplified. 2nd ed. Ames: Iowa State University Press, 1988.

MLA (9th ed.) Citation

Harpstead, Milo I., et al. Soil Science Simplified. 2nd ed. Iowa State University Press, 1988.