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Bushallow-Wilbur, L.; DeVinney, G; Whitcomb, F.: Electronic mail reference service : a study (1996)
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Godfrey, K.: ¬A new world for virtual reference (2008)
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Barry, E.; Bedoya, J.K.; Groom, C.; Patterson, L.: Virtual reference in UK academic libraries : the virtual enquiry project 2008-2009 (2010)
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Hixson, C.R.: CD-ROM and the undergraduate : reference and instruction at risk (1993)
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Bucknall, T.; Mangrum, R.: U-search : a user study of the CD-ROM service at the University of North Carolina at Chapel Hill (1992)
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