Sutter, Robert G
Lanham Rowan & Littlefield, 2016
Buku Teks
Spanier, John
Frederck A. Praeger, 1968
Buku Teks
Grachev, Andrei
Poloty Press, 2008
Buku Teks
Abou-El-Fadl, Reem
Cambridge University Press, 2018
eBooks
Callahan, David
Harper Collins , 1994
Buku Teks