Bender, P. S. (1976). Design and operation of customer service systems. AMACOM.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBender, Paul S. Design and Operation of Customer Service Systems. New York: AMACOM, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBender, Paul S. Design and Operation of Customer Service Systems. AMACOM, 1976.
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