Troeh, F. R. (2004). Soil and water conservation: For productivity and environmental protection (4. ed.). Pearson/Education.
Chicago-Zitierstil (17. Ausg.)Troeh, Frederick R. Soil and Water Conservation: For Productivity and Environmental Protection. 4. ed. Upper Saddle River, N.J: Pearson/Education, 2004.
MLA-Zitierstil (9. Ausg.)Troeh, Frederick R. Soil and Water Conservation: For Productivity and Environmental Protection. 4. ed. Pearson/Education, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.