Donahue, R., Hobbs, J. A., & Troeh, F. R. (1999). Soil and water conservation: Productivity and environmental protection (Ed.3.).
Chicago Edition CitationDonahue, Royl, J Arthur Hobbs, and Frederick R. Troeh. Soil and Water Conservation: Productivity and Environmental Protection. Ed.3. New jersey, Prentice Hall, 1999.
MLA Edition CitationDonahue, Royl, et al. Soil and Water Conservation: Productivity and Environmental Protection. Ed.3. 1999.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.