African political systems
edited by M. Fortes and E.E. Evans-Pritchard
Oxford University Press, 1950
 Buku Teks
Easton, David, author
A systems analysis of political life
John Wiley & Sons, 1965
 Buku Teks
Maor
Political Parties & Party Systems
 Buku Teks
Eisenstadt, S. N. (Shmuel Noah), author
The Political systems of empires
Free Press, 1967
 Buku Teks
Political systems and the distribution of power
edited by Michael Banton
Tavistock Publications, 1972
 Buku Teks
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