APA

Kohls R. L., . (1980). Marketing of agricultural products. E.U.A: Macmillan.

Chicago

Kohls Richard L, . 1980. Marketing of agricultural products. E.U.A: Macmillan.

Harvard

Kohls R. L., . (1980). Marketing of agricultural products. E.U.A: Macmillan.

MLA

Kohls Richard L, . Marketing of agricultural products. E.U.A: Macmillan. 1980.