1Gottesman, Laura. Digital reference: bringing the reference desk to cyberspace. Library of Congress Information Bulletin, 2002,61(3-4). 被引量：1
2Barbara, Quint. QuestionPoint marks new era in virtual reference. Information Today, 2002 Jul/Aug: 50 - 54. 被引量：1
3Faster facts:the library of congress tests its virtual reference network.Government Computer News,May 28,2001. 被引量：1
4Libraries offer online refefence services to one another.The Chronicle of Higher Education(Information Technology),May 22,2001. 被引量：1
5Offering high quality reference service on the web: the Collaborative Digital Reference Service (CDRS). D-Lib Magazine, June 2000. 被引量：1
6Kresh D N.Libraries meet the world wide web:the collaborative digital reference service. ARL Bimonthly Report 219,December 2001. 被引量：1
7Library reference goes live on the net,Available 24／7.Institute of Museum and Library Services:Library Highlight of the Month,August 200l. 被引量：1
8Langlois G.A need to know:library of congress creates global network to track down answers to tough questions. Federal Computer Week,July 2,2001. 被引量：1
