2[1]National Research Council, Center for Science, Mathematics, and Engineering Education. Developing a Digital National Library for Undergraduate SME&T. National Academy Press, Washington, D.C. 1998
3[2]Bishop, A.P. Working towards an understanding of digital library use. D- Lib Magazine, 1995(10): 17 ～ 23
4[3]Billings, H. Library collections and distance information: new models of collection development for the 21st century. Journal of Library Administration, 1998,24(1/2) :3 ～ 7
