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Westbrook, L.: Unanswerable questions at the IPL : user expectations of e-mail reference (2009)
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Singh, S.: Ranganathan and reference services (1992)
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Lavin, M.R.: Improving the quality of business reference service (1995)
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Carbone, J.J.: Small public libraries : suggestions for reference service improvement (1988)
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Murfin, M.E.: Evaluation of reference service by user report of success (1995)
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