Gaya APA

Troeh, M, R. 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.2 New Jersey: Prentice-Hall, 1980. Textbook.