Eisenstadt, Shmuel Noah
The political system of empires
Free Press, 1969
 Buku Teks
African political systems
edited by M. Fortes and E.E. Evans-Pritchard
Oxford University Press, 1950
 Buku Teks
Maor
Political Parties & Party Systems
 Buku Teks
Political systems and the distribution of power
edited by Michael Banton
Tavistock Publications, 1972
 Buku Teks
Modern political systems: Asia
editors, Robert E. Ward and Roy C. Macridis
Prentice-Hall, 1963
 Buku Teks