Coyle, David Cushman, 1887-1969
The United Nations and how it works
Columbia University Press, 1963
 Buku Teks SO
Coyle, David Cushman, 1887-1969
The United Nations and how it works
The New Americanan Library, 1962
 Buku Teks SO
Kay, David A.
The United NAtions political system
John wiley ,
 Buku Teks SO
The 2004 Indonesian elections: How the system works and what the parties stand for: a report on political parties
 Artikel Jurnal
Sundquist, James L
Dynamics of the party system: alignment realignment of political parties in the United States/ James L. Sundquist
The Brooking Institution, 1973
 Buku Teks SO