KATZ BERNARD. (1987). HOW TO TURN CUSTOMER SERVICE IN TO CUSTOMER SALES. WILDWOOD HOUSE LTD.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKATZ BERNARD. HOW TO TURN CUSTOMER SERVICE IN TO CUSTOMER SALES. ENGLAND: WILDWOOD HOUSE LTD, 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKATZ BERNARD. HOW TO TURN CUSTOMER SERVICE IN TO CUSTOMER SALES. WILDWOOD HOUSE LTD, 1987.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.