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Smith, L.C.: Reference services (2009)
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Aghemo, A.: Come valutare il servizio di informazione (1993)
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Hults, P.: Reference evaluation : an overview (1992)
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Whitlatch, J.B.: Reference services : research methodologies for assessment and accountability (1992)
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Gross, M.: ¬The imposed query : implications for library service evaluation (1998)
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