O`Hair, Dan, author
Allyn and Bacon, 2011
Buku Teks
Buergenthal, Thomas
Syracuse University Press, 1969
Buku Teks
Bestari Ulfah, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2016
UI - Makalah dan Kertas Kerja
Wei Choo, Chun
Oxford university press, 1998
Buku Teks
Conrad, Charles, author
Wiley Blackwell, 2012
Buku Teks