7[1]Michael McClennen, Patricia Memmott. Roles in Digital Refer ence. Information Technology & Libraries, 20(3)
8[2]Carol Tenopir. Virtual Reference Services in a Real World.Library Journal, 126(12)
9[3]Joseph Janes, David Carter, Patricia Memmott. Digital Reference Services in Academic Libraries. Reference & User Services Quarterly, 39(2)
10J. Srivastava,R. Cooley,et al. Web Usage Mining:Discovery and Applications of Usage patterns from Web Data. SIGKDD Explorations, 2000,1 ( 1 ) : 12--23.