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MLA

Bills, Nelson L, et al. "Assessing Erosion On U.s. Cropland : Land Management and Physical Features." , 19. Print

APA

Bills, N. L, Heimlich, R. E, United States, U. States, Department of Agriculture, D. of Agriculture, & Economic Research Service, E. Research Service. (1984). Assessing erosion on U.S. cropland : land management and physical features.

Chicago

Bills, Nelson L., Ralph E Heimlich, United States, Department of Agriculture, and Economic Research Service. "Assessing erosion on U.S. cropland : land management and physical features" (0000): 19.