2Laverna. Saunders. Building the virtual reference http://www. infotoday . com/it/mar01/saunders. htm.?A?A?A?A
3Bemie. Sloan. Digital reference service bibliography. http://www.lis. uiuc. edu/.
4About VRD. http://www. vrd. org/about shtml .
5MARS AD Hoc Committee on Virtual Reference Guidelines. Draft Guidelines for Implementing and Maintaining Virtual Reference Service. http ://www. ala. org/Content/Navigation Menu/RUSA/.
6Doig GS, Simpson F. Efficient literature searching: a core skill for the practice of evidence-based medicine[J]. Intensive Care Med, 2003; 29(12): 2 119-2 127
7王知津 崔永斌.科技信息检索[M](第1版)[M].天津:南开大学出版社,.20.
8Robert Kiley, editor-in-chief. Medical information on the internal[M]. 3rd ed. Ma FC et al(translation). Shenyang: Liaoning Science & Technology Press, 2003. p. 347-352Robert Kiley, 主编. Internet医学信息检索指南[M].
101，Sachett DL,Richardson WS,RosenbergW,et al.On the Need for Evidence-Based Medicine In:Evedence-Based Medicine How to practiceand teach EBM.des.David L.Sachett,W.Soctt Richerdson et al.New York 1997.
