Gyeszly, Suzanne D., author
The Borgo Press, 1994
Buku Referensi
Ross, Sheri V. T., author
California Libraries Unlimited, 2016
Buku Teks
Anderson, David A., author
Taylor & Francis Group, 2014
Buku Teks
Rubenstein, Harvey M.
New York: John Wiley & Sons, 1980
Buku Teks
Schwedt, Georg, author
John Wiley & Sons, 2001
Buku Teks