Ostrom, Vincent
The Meaning of democracy and the vulnerability of democracies
University of Michigan Press, 1997
 Buku Teks SO
Padover, Saul K. (Saul Kussiel)
The meaning of democracy : an appraisal of the american experience
Frederick A. Praeger, 1963
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Arblaster, Anthony
Democracy
Open University Press, 1987
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Schulz, Ernest B
Democracy
[publisher not identified], 1956
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Catt, Helena
Democracy in practice
Routledge , 1999
 Buku Teks SO