Troeh, F. R., Donahue, R. L., & Hobbs, J. A. (1980). Soil and water conservation for productivity and environmental protection. Prentice-Hall.
Chicago-čujuhus (17. p.)Troeh, Frederick R., Roy L. Donahue, juo J. Arthur Hobbs. Soil and Water Conservation for Productivity and Environmental Protection. Englewood Cliffs, N.J: Prentice-Hall, 1980.
MLA-čujuhus (9. p.)Troeh, Frederick R., et al. Soil and Water Conservation for Productivity and Environmental Protection. Prentice-Hall, 1980.
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