Sparkes, A.W
Routledge, 1994
Buku Teks
Sparkes, A.W.
Routledge, 1991
Buku Teks
Buchanan, James M., author
Liberty Fund, 2000
Buku Referensi
Harain Surat Kabar Kompas, 2002
Buku Teks
The International Political Science Association, 2009
Buku Referensi