CHARLES E DAY. (2000). Call center operations (0 07 016430 4). McGraw-Hill.
シカゴスタイル引用形CHARLES E DAY. Call Center Operations (0 07 016430 4). McGraw-Hill, 2000.
MLA引用形式CHARLES E DAY. Call Center Operations (0 07 016430 4). McGraw-Hill, 2000.
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