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McCrea, R.: Evaluation of two library-based and one expert reference service on the Web (2004)
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Lewis, D.W.: Making academic reference service work (1994)
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Lewis, K.M.; DeGroote, S.L.: Digital reference access points : an analysis of usage (2008)
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Janes, J.; Hill, C.; Rolfe, A.: Ask-an-expert services analysis (2001)
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Watstein, S.: Reference service in a digital age (1998)
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