Jayapalan, N.
Modern governments and constituitions
Atlantic Publishers and Distributors, 2002
 Buku Teks SO
Zink, Harold
Government of cities in the United States / Harold Zink
Macmillan, 1948
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Documents on major European governments
edited by Randolph L. Braham
Alfred A. Knopf, 1966
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Moore, Russell F.
Modern constitutions
Littlefield, Adams, 1957
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Magstadt, Thomas M.
Nations and governments : comparative politics in regional perspective
Thomson wadsworth, 2005
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