Bopp, Richard E., author
Libraries Unlimited, 2001
Buku Teks
edited by Maxine Melling
Facet Publishing, 2005
Buku Teks
Gale Research, 1991
Buku Referensi
Ronan, Jana Smith, author
Libraries Unlimited, 2003
Buku Teks
Cassell, Kay Ann, author
Facet Publishing, 2006
Buku Teks