4[1]Marry E. Jackson. Dccument Delivery over the Internet. Online,1993,17(2): 14
5[2]Marry E. Jackson, Karen Croneis. Uses of Document Delivery Services. Washingten. DC: Association of Research Libraries,1994
6[3]Amy Chang, Marry E. Jackson. Managing Resource Sharing in the Elecrronic Age. New york:AMS press, 1996
7[4]Shirley Baker, marry E. Jackson. Maximing Access, Minimizing Cost: A First Step Toward the Information Access Future.Washington, DC: ARL Committee on Access to information Resources, 1994
8[5]Herbert S. White. The Cost of Knowledge and the Cost of Ignorance. Library Journal, 1995,120(11) :48 ~ 49
9[6]Randall Wayne Marcinko. Issues in Commercial Document Delivery. Library Trends, 1997,45(3) :531 ~ 550
10[7]Robin Kinder. Introduction: Four Views of Document Delivery Services. The Reference Librarian, 1999(63): 1~23