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