O'Sullivan, L. (2010). Client service excellence: The 10 commandments. Knowres Publishing.
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Chicago-čujuhus (17. p.)
O'Sullivan, Larry. Client Service Excellence: The 10 Commandments. Randburg, Republic of South Africa: Knowres Publishing, 2010.
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MLA-čujuhus (9. p.)
O'Sullivan, Larry. Client Service Excellence: The 10 Commandments. Knowres Publishing, 2010.
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