Freymond, Jacques
Western Europe since the war
Frederick A. Preager, 1964
 Buku Teks
Maddex, Robert L.
Constitutions of the world
London: Routledge, 1995,
 Buku Referensi
Heringa, A.W.
Constitutions compared : an introduction to comparative constitutional law
Metro, 2009
 Buku Teks
Hawgood, John A.
Modern constitutions: Since 1787
Macmillan & Co. Limited, 1939
 Buku Teks
Hawgood, John A.
Modern constitutions since 1787/John A. Hawgood
Macmillan and co., limited, 1939
 Buku Teks