Cita APA (7th ed.)

Troeh, F. R., Hobbs, J. A., & Donahue, R. L. (1991). Soil and water conservation (2nd edition.). Prentice-Hall.

Cita Chicago (17th ed.)

Troeh, Frederick R., J. Arthur Hobbs, i Roy Luther Donahue. Soil and Water Conservation. 2nd edition. Englewood Cliffs, N.J: Prentice-Hall, 1991.

Cita MLA (9th ed.)

Troeh, Frederick R., et al. Soil and Water Conservation. 2nd edition. Prentice-Hall, 1991.