Cambridge University Press, 2015
Buku Teks
Goscha, Christopher E., author
Nias Press, 2012
Buku Referensi
Esposito, Vincnet
Praeger, 1965
Buku Teks
Overy, Richard, author
Andre Deutsch, 2014
Buku Teks
Grob, Fritz, author
Yale University Press, 1949
Buku Klasik