Friedrich, Carl J.
Constitutional government and democracy theory and practice in Europe and America
Blaisdell, 1949
 Buku Teks
Beaumont, Elizabeth
The civic constitution: civic visions and struggles in the path toward constitutional democracy
Oxford University Press, 2014
 Buku Teks
Jong, Jelle Jan de, 1921-
Politieke organisatie in west Europa na 1800=Political organisation in western Europe since 1800 / Jelle Jan de Jong
M. Nijhoff, 1951
 Buku Teks
Helfritz, Hans,1877-
Allgemeines staatsrecht : mit einem abriss der staatstheorien / Hans Helfritz
Albert Nauck & Co., 1949
 Buku Teks
Pylee, M.V.
Constitutional government in India
Asia Publishing House, 1960
 Buku Teks