WILLSMER RAY. (1984). BASIC ART OF MARKETING (2ND.). BUSINESS PUBLICATION.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWILLSMER RAY. BASIC ART OF MARKETING. 2ND. LONDON: BUSINESS PUBLICATION, 1984.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWILLSMER RAY. BASIC ART OF MARKETING. 2ND. BUSINESS PUBLICATION, 1984.
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