Arledge, J. E., Arnold, R. W., Benvenuti, D. N., Birdwell, B. T., Calhoun, T. E., Moldenhauer, W. C. 1., & Hudson, N. W. (1988). Conservation farming on steep lands. Ankeny, Iowa: Soil and Water Conservation Society.

Arledge, Jerome E., Richard W. Arnold, Davi Nathan Benvenuti, Bobby T. Birdwell, Thomas E. Calhoun, William C.‏ 1923- Moldenhauer, and Norman W. Hudson. Conservation Farming On Steep Lands. Ankeny, Iowa: Soil and Water Conservation Society, 1988.

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