New York : American Political Science Association
Majalah, Jurnal, Buletin
Saito, Hirosi
Boston Marshall Jones 1935
Buku Teks
Jansen, Marius B.
Harvard University Press, 1967
Buku Teks
Haas, Egbert
Leiden Universitaire Pers Leiden 1956
Buku Teks
New York : Academy of Political Science
Majalah, Jurnal, Buletin