Kohls, R. L., & Uhl, J. N. (1998). Marketing of agricultural products (8th ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Kohls, Richard L., agus Joseph N. Uhl. Marketing of Agricultural Products. 8th ed. Upper Saddle River, NJ: Prentice Hall, 1998.
Lua MLA (9ú heag.)Kohls, Richard L., agus Joseph N. Uhl. Marketing of Agricultural Products. 8th ed. Prentice Hall, 1998.
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