GERSON RICHARD F. (2004). BEYOND CUSTOMER SERVICE. VIVA BOOKS PVT.LTD.
Chicago-čujuhus (17. p.)GERSON RICHARD F. BEYOND CUSTOMER SERVICE. NEW DELHI: VIVA BOOKS PVT.LTD, 2004.
MLA-čujuhus (9. p.)GERSON RICHARD F. BEYOND CUSTOMER SERVICE. VIVA BOOKS PVT.LTD, 2004.
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