Snodgrass, M. M., & Wallace, L. T. (1980). Agriculture, economics, and resource management (2d ed.). Prentice-Hall.
Tohutoru Kātū Chicago (17th ed.)Snodgrass, Milton Moore, me Luther T. Wallace. Agriculture, Economics, and Resource Management. 2d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1980.
Tohutoro MLA (9th ed.)Snodgrass, Milton Moore, me Luther T. Wallace. Agriculture, Economics, and Resource Management. 2d ed. Prentice-Hall, 1980.