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Jansson, B.L.: ¬A Swedish survey of the quality of reference services (1997)
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Matson, M.: Missouri Statewide Reference Center (1992)
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Hogan, D.R.: Cooperative reference service and the referred reference question : an annotated bibliography (1995)
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Quinn, B.: Improving the quality of telephone reference services (1995)
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McCrea, R.: Evaluation of two library-based and one expert reference service on the Web (2004)
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