Troeh,Frederick R, Donahue,Roy L, & Hobbs,Arthur J. (1999). Soil and water conservation: Productivity and environmental protection (3.). Prentice -Hall.
Chicago Edition CitationTroeh,Frederick R, Donahue,Roy L, and Hobbs,Arthur J. Soil and Water Conservation: Productivity and Environmental Protection. 3. New Jersey: Prentice -Hall, 1999.
MLA Edition CitationTroeh,Frederick R, et al. Soil and Water Conservation: Productivity and Environmental Protection. 3. Prentice -Hall, 1999.
Warning: These citations may not always be 100% accurate.