Urofsky, Melvin I., author
University Press of Kansas, 2000
Buku Teks
MUhammad Munir, author
Cambridge University Press , 2008
Artikel Jurnal
Koplow, David A, author
Cambridge University Press, 2006
Buku Teks
Stefan, Susan, author
Oxford University Press, 2016
eBooks
Hambro, Edvard, author
A.W. Sythoff, 1963
Buku Teks