WIERSEMA FRED. (1998). CUSTOMER SERVICE. HARPER COLLINS PUBLISHERS.
Chicagoスタイル(17版)引用形式WIERSEMA FRED. CUSTOMER SERVICE. NEW YORK: HARPER COLLINS PUBLISHERS, 1998.
MLA(9版)引用形式WIERSEMA FRED. CUSTOMER SERVICE. HARPER COLLINS PUBLISHERS, 1998.
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