Enis, B. M. (1980). Marketing principles (Third edition.). Goodyear Publishing Company, Inc.
Chicago Style (17th ed.) CitationEnis, Ben M. Marketing Principles. Third edition. Sta. Monica, California: Goodyear Publishing Company, Inc, 1980.
ציטוט MLAEnis, Ben M. Marketing Principles. Third edition. Goodyear Publishing Company, Inc, 1980.
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