Kohls, R. (2002). Marketing of agricultura; products (9th.). Prentice Hall.
Chicago-viite (17. p.)Kohls, Rochard. Marketing of Agricultura; Products. 9th. New Delhi: Prentice Hall, 2002.
MLA-viite (9. p.)Kohls, Rochard. Marketing of Agricultura; Products. 9th. Prentice Hall, 2002.
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