Rothschild, Bruce M., author
Springer, 2012
eBooks
"New York: Andromedia Oxford, 1994.",
Buku Teks
editors, Tim Halliday, Kraig Adler
Facts on File, 1994
Buku Referensi
Blum, Mark, author
Chronicle Books, 1999
Buku Referensi
Zug, George R., author
Academic Press, 1993
Buku Teks