Maddex, Robert L.
Constitutions of the world
London: Routledge, 1995,
 Buku Referensi
Moore, Russell F.
Modern constitutions
Littlefield, Adams, 1957
 Buku Teks
Andrews, William G.
Constitutions and constitutionalism
D.van Nostrand Company,Inc., 1968
 Buku Teks
Gibson, William M.
The Constitutions of Colombia
Duke University Press, 1948
 Buku Teks
Wheare, K. C.
Modern constitutions
Oxford University Press, 1975
 Buku Teks