FREEMANTLE, D. (1992). Incredible Customer Service. McGraw-Hill.
Chicagoスタイル(17版)引用形式FREEMANTLE, David. Incredible Customer Service. McGraw-Hill, 1992.
MLA(8版)引用形式FREEMANTLE, David. Incredible Customer Service. McGraw-Hill, 1992.
警告: この引用は必ずしも正確ではありません.