Ball, David, author
Facet Publishing, 2005
Buku Teks
Fasick, Adele M., author
Libraries Unlimited , 1991
Buku Teks
Chalmers, James, author
Glorier International, 1999
Buku Referensi
Artikel Jurnal
Cortez, Edwin M.
American Library Association, 1987
Buku Referensi