The International Political Science Association, 2009
Buku Referensi
[compiled by] J. Charles King [and] James A. McGilvray
McGraw-Hill, 1973
Buku Teks SO
edited by David Ingram
Blackwell , 2002
Buku Teks SO
Finkle, Jason L.
John Wiley & Sons, 1968
Buku Teks SO
Finkle, Jason L.
John Wiley & Sons, 1966
Buku Teks SO