Timm, P. R. (1998). Customer service: Carrer success through customer satisfaction. Prentice-Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTimm, Paul R. Customer Service: Carrer Success Through Customer Satisfaction. Upper River, N. J: Prentice-Hall, 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTimm, Paul R. Customer Service: Carrer Success Through Customer Satisfaction. Prentice-Hall, 1998.
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