R., T., M. et al.(1980).Soil and water conservation for productivity and environmental protection / Frederick R. Troeh, J. Arthur Hobbs, Roy L. Donahue; editorial assistance, Miriam R. Troeh (Cet.2).New Jersey:Prentice-Hall.
Gaya MLA
Troeh, Miriam, R.. et al."Soil and water conservation for productivity and environmental protection / Frederick R. Troeh, J. Arthur Hobbs, Roy L. Donahue; editorial assistance, Miriam R. Troeh".Cet.2New Jersey:Prentice-Hall,1980.Textbook.