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Reference and information services : an introduction (1991)
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Webb, S.P.: Creating an information service (1996)
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Nicholas, D.: Assessing information needs : tools and techniques (1996)
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Gurnsey, J.; White, M.: Information consultancy (1988)
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Reference and information services : an introduction (2001)
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Reference and information services : an introduction (1995)
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Nicholas, D.: Assessing information needs : tools, techniques and concepts for the Internet age (2000)
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