Spencer, Herbert
Watts & Co., 1950
Buku Teks
R. A. W. Rhodes [and others]
Open University press, 2003
Buku Teks
H. Muhammad Mutawally
Sekolah Kajian Stratejik dan Global Universitas Indonesia, 2010
UI - Tesis (Open)
Fox, Richard G.
Faculty of Law, Monash University, 1995
Buku Teks
Faber, Stuart J.
Lega - Book, 1978
Buku Teks