RYAN, W. T. (1980). Personal Learning Aid For Principles Of Marketing William T Ryan. Dow Jones Irwin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRYAN, William T. Personal Learning Aid For Principles Of Marketing William T Ryan. Dow Jones Irwin, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRYAN, William T. Personal Learning Aid For Principles Of Marketing William T Ryan. Dow Jones Irwin, 1980.
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