KARR R. (1998). COMPLETE IDIOT`S GUIDE TO GREAT CUSTOMER SERVICE. PRENTICE -HALL INTERNATIONAL, INC.
Lua i Stíl Chicago (17ú heag.)KARR R. COMPLETE IDIOT`S GUIDE TO GREAT CUSTOMER SERVICE. NEW DELHI: PRENTICE -HALL INTERNATIONAL, INC, 1998.
Lua MLA (9ú heag.)KARR R. COMPLETE IDIOT`S GUIDE TO GREAT CUSTOMER SERVICE. PRENTICE -HALL INTERNATIONAL, INC, 1998.
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