Gerson, R. F. (1998). Beyond customer service, revised (Rev. ed.). Crisp Publications.
Chicago-čujuhus (17. p.)Gerson, Richard F. Beyond Customer Service, Revised. Rev. ed. Menlo Park, Calif.: Crisp Publications, 1998.
MLA-čujuhus (9. p.)Gerson, Richard F. Beyond Customer Service, Revised. Rev. ed. Crisp Publications, 1998.
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