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Tyckoson, D.A.: Wrong questions, wrong answers : behavioral vs. factual evaluation of reference service (1992)
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Saxton, M.L.: Reference service evaluation and meta analysis : findings and methodological issues (1997)
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Richardson, J.V.: Question master : an evaluation of a Web-based decision-support system for use in reference environments (1998)
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Frické, M.; Fallis, D.: Indicators of accuracy for answers to ready reference questions an the Internet (2004)
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Radford, M.L.: Encountering virtual users : a qualitative investigation of interpersonal communication in chat reference (2006)
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