4BarcelIos S. Understanding intennedlation in a digital, environment: an dxploratory case study [J/OL], Paper Presented at Faeeta of Digital Reference Coference,2000, (10) : 16 - 17. http://www.vrd.org/conferences/VRD2000/priceedings/Barcellos_fi_nal.shtml.
5Johnston P E. Digital Reference as an Instructional Tool. Searcher,2003 (5).