Cita APA

Troeh, F. R., Hobbs, J. A., & Donahue, R. L. (1999). Soil and water conservation: Productivity and environmental protection (3a. ed.). Prentice Hall.

Citación estilo Chicago

Troeh, Frederick R., J. Arthur Hobbs, and Roy L. Donahue. Soil and Water Conservation: Productivity and Environmental Protection. 3a. ed. Upper Saddle River: Prentice Hall, 1999.

Cita MLA

Troeh, Frederick R., et al. Soil and Water Conservation: Productivity and Environmental Protection. 3a. ed. Prentice Hall, 1999.