APA (7th ed.) Citation

Harpstead, M. I., & Hole, F. D. (1980). Soil science simplified. Iowa State University Press.

Chicago Style (17th ed.) Citation

Harpstead, Milo I., and Francis Doan Hole. Soil Science Simplified. Ames, Iowa: Iowa State University Press, 1980.

MLA (9th ed.) Citation

Harpstead, Milo I., and Francis Doan Hole. Soil Science Simplified. Iowa State University Press, 1980.