FOSTER, D. (1993). Sales And Marketing For The Travel Professional Dennis L.foster. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFOSTER, Dennis. Sales And Marketing For The Travel Professional Dennis L.foster. McGraw-Hill, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFOSTER, Dennis. Sales And Marketing For The Travel Professional Dennis L.foster. McGraw-Hill, 1993.
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