Alford, B.W.E.
Macmillan, 1988
Buku Teks
Hubbard, G. E.
International Secretariat Institute of Pasific Relations , 1943
Buku Teks
Rifki Firdaus
2010
UI - Skripsi (Open)
Mansfield, Edwin
W.W. Norton, 1974
Buku Teks
Cullingworth, J.B.
Allen & Unwin, 1979
Buku Teks