GERSON RICHARD F. (2004). BEYOND CUSTOMER SERVICE. VIVA BOOKS PVT.LTD.
Chicagoスタイル(17版)引用形式GERSON RICHARD F. BEYOND CUSTOMER SERVICE. NEW DELHI: VIVA BOOKS PVT.LTD, 2004.
MLA(9版)引用形式GERSON RICHARD F. BEYOND CUSTOMER SERVICE. VIVA BOOKS PVT.LTD, 2004.
警告: この引用は必ずしも正確ではありません.