1[1]Quint, Barbara. QuestionPoint Marks New Era in Virtual Reference. http://www. infotoday. com/newsbreaks/nb020610 -1. htm
2[2]Penka, Jeffrey T. The Technological Challenges of Digital Reference. D-Lib Magazine, 2003 Vol. 9 No. 2. http://www.lib. org/dlib/february03/penka/02penka. html
3[3]Carlson, Scott. New Service Allows the Public to Pose Reference Questions Without Visiting the Library. http://chro nicle. com/free/2002/05/2002053101t. htm
4[4]Bunge, C. A. 8 Ferguson, C. D. The Shape of Services to Come: Values-Based Reference Service for the Largely Digital Library. College & Research Libraries, 252-265
5[5]Coffman, S. Well Take It From Here: Further Developments Wed Like to See in Virtual Reference Software. Information Technology and Libraries, 149- 50.
6[6]Janes, J. Digital Reference: Reference Librarians' Experiences and Attitudes. Journal of the American Society for Information Science and Technology, 53 (7), 549-566.
7[7]Milewski, S. An Evaluation and Comparison of Popular VRD Applications. Virtual Reference Desk Con-ference 2002. http://www. oclc. org/institute/events/vrd2002/presentationsdltl sl/t_ldl_si_files/frame. htm.
8[8]Nua. com. Nua Internet How Many Online. Nua Internet Surveys. http://www. nua. ie/surveys/how_many_online/index.html.
9[9]Tenopir, C. & Ennis, L. A Decade of Digital Reference 1991-2001. Reference & User Services Quarterly, vol. 41, no.3. 264-73.
