Baldwin, David A. (David Allen), author
Libraries Unlimited, 2003
Buku Referensi
Usherwood, Bob, author
Library Association, 1981
Buku Teks
Mitchell, Anne M., author
Neal-Schuman Publishers, 2005
Buku Referensi
Artikel Jurnal
Leong, Carol L. H.
American Library Association, 1989
Buku Referensi