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2http://www.loc.gov
3http://www.vrd.org
4http://www.ipl.org/ref/
5Roy Tennant. Virtual Reference: How to Personal Service to the Web http://proton.wils.wisc.edu/events/ww2k/ww2kpres/reference/sldol.htm
6Sam Stormont. Interactive Reference ProjectAssessment After Two Years. http://www.vrd.org/conferences/VRD2000/proceedings/stormont.shtml
7Lessick, S., Kjaer, K. & Clancy, S. (1997). Interactive Reference Service at UC Irvine: Expanding Reference Service Beyond the Reference Desk.: http://www.ala.org/acrl/paperhtm/a10.htm
