Hiebeler, R. (1998). Best Practices Building Your Business With Customer-focused Solutions Robert Hiebeler, Thomas B. Kelly, Charles Ketteman. Simon & Schuster.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHiebeler, Robert. Best Practices Building Your Business With Customer-focused Solutions Robert Hiebeler, Thomas B. Kelly, Charles Ketteman. Simon & Schuster, 1998.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHiebeler, Robert. Best Practices Building Your Business With Customer-focused Solutions Robert Hiebeler, Thomas B. Kelly, Charles Ketteman. Simon & Schuster, 1998.
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