Kohls, R. L. (2002). Marketing of agricultural products. Upper Saddle River, NJ: Prentice Hall.
शिकागो स्टाइल उद्धरणKohls, Richard L. Marketing of Agricultural Products. Upper Saddle River, NJ: Prentice Hall, 2002.
एमएलए उद्धरणKohls, Richard L. Marketing of Agricultural Products. Upper Saddle River, NJ: Prentice Hall, 2002.
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