1Carol Tenopir,Lisa Ennis.The Impact of Digital Reference on Librarians and Library Users[].Online.1998
2Carol Tenopir,Ralf Neufang.Electronic Reference Options: Tracking the Changes[].Online.1995
3Nancy K Herther.CD-ROM in Libraries: A Ten year Anniversary Report[].Online.1995
4Charles. P Boume,Jo Robinson.Education and Training for Computer-Based Reference Services: Review of Training Efforts to Date[].Journal of the American Society for Information Science.1980
5Tenopin, Carol,Lisa, Ennis.The Digital Reference World of Academic Libraries[].Online.1998
