Bearden, W. O. (1998). Marketing Principles And Perspective William O. Bearden, Thomas N. Ingram, Raymond W. Laforge. Irwin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBearden, William O. Marketing Principles And Perspective William O. Bearden, Thomas N. Ingram, Raymond W. Laforge. Irwin, 1998.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBearden, William O. Marketing Principles And Perspective William O. Bearden, Thomas N. Ingram, Raymond W. Laforge. Irwin, 1998.
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