BLY ROBERT W. (1992). BUSINESS TO BUSINESS DIRECT MARKETING. NTC BUSINESS BOOKS.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBLY ROBERT W. BUSINESS TO BUSINESS DIRECT MARKETING. LINCOLNWOOD: NTC BUSINESS BOOKS, 1992.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBLY ROBERT W. BUSINESS TO BUSINESS DIRECT MARKETING. NTC BUSINESS BOOKS, 1992.
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