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Brandt, K.A.; Campbell, J.M.; Bryant, W.F.: Reflections on reference services (1996)
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Moore, A.: As I sit studying : WWW-based reference services (1998)
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New technologies and reference services (2000)
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Smith, L.C.: Reference services (2009)
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Nicholls, P.; Sutherland, T.: CD-ROM databases : a survey of commercial publishing activity (1992)
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