FUTRELL, C. M. ABC-s of Relationship Selling Through Service. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFUTRELL, Charles M. ABC-s of Relationship Selling Through Service. McGraw-Hill.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFUTRELL, Charles M. ABC-s of Relationship Selling Through Service. McGraw-Hill.
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