Johns, T. (1994). Perfect customer care: All you need to get it right first time. Arrow, Random House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohns, Ted. Perfect Customer Care: All You Need to Get It Right First Time. London : UK: Arrow, Random House, 1994.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJohns, Ted. Perfect Customer Care: All You Need to Get It Right First Time. Arrow, Random House, 1994.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.