FREEMANTLE, D. (1992). Incredible Customer Service. McGraw-Hill.
Chicago Style (17th ed.) CitationFREEMANTLE, David. Incredible Customer Service. McGraw-Hill, 1992.
MLA引文FREEMANTLE, David. Incredible Customer Service. McGraw-Hill, 1992.
警告：这些引文格式不一定是100％准确.