Norman, Sandy, author
Library Association Publishing, 1996
Buku Referensi
Reeves, T. Zane, author
Wadsworth, 2006
Buku Teks
McCook, Kathleen de la Pena, author
Neal-Schuman, 2004
Buku Teks
edited by Robert Golembiewski
Peacook, 1969
Buku Teks
Stillman, Richard J., author
Wadsworth and Cengage Learning, 2010
Buku Teks