Jayapalan, N.
Modern governments and constituitions
Atlantic Publishers and Distributors, 2002
 Buku Teks SO
Documents on major European governments
edited by Randolph L. Braham
Alfred A. Knopf, 1966
 Buku Teks SO
Magstadt, Thomas M.
Nations and governments : comparative politics in regional perspective
Thomson wadsworth, 2005
 Buku Teks SO
Moore, Russell F.
Modern constitutions
Littlefield, Adams, 1957
 Buku Teks SO
Zink, Harold
Modern governments
D. Van Nostrand, 1962
 Buku Teks