Hagler, Ronald, author
American Library Association, 1991
Buku Teks
Hagler, Ronald, author
American Library Association, 1997
Buku Teks
American Library Association,
Majalah, Jurnal, Buletin
Kochtanek, Thomas R., author
Libraries Unlimited , 2002
Buku Teks
edited by C.W.J. Wilson
Aslib, 1977
Buku Referensi