1Faster facts:the library of congress tests its virtual reference network.Government Computer News,May 28,2001.
2Libraries offer online refefence services to one another.The Chronicle of Higher Education(Information Technology),May 22,2001.
3Offering high quality reference service on the web: the Collaborative Digital Reference Service (CDRS). D-Lib Magazine, June 2000.
4Kresh D N.Libraries meet the world wide web:the collaborative digital reference service. ARL Bimonthly Report 219,December 2001.
5Library reference goes live on the net,Available 24／7.Institute of Museum and Library Services:Library Highlight of the Month,August 200l.
6Langlois G.A need to know:library of congress creates global network to track down answers to tough questions. Federal Computer Week,July 2,2001.
7Penka J T. The Technological Challenges of Digital Reference: An Overview. D-Lib Magazine, 2003, 9(2).
8Kasowitz A S. Trends and Issues in Digital Refcrcnce Services.ERIC Digest, November 2001.
9Gross M, etc. Assessing Quality in Digital Reference Services:Overview of Key Literature on Digital Reference. http://quartz.syr.edu/quality/default.htm,November 2001.
10Gross M,etc. Assessing Quality in Digital Reference Services:PhaseⅡ, Site Visit Summary Report. http://quartz.syr.edu/quality/default.htm, November 2001.
