Brogan, D.W. (Denis William)
Political patterns in todays world
Harcourt, Brace & World, 1963
 Buku Teks SO
Major companies of europe 1988 : volume 2 major companies of the United Kingdom
edited by R.M. Whiteside
Graham and Trotman, 1988
 Buku Referensi
Major companies of europe 1988 : volume 3, major companies of western europe outside the european economic community
edited by R.M. Whiteside
Graham and Trotman, 1988
 Buku Referensi
Hayes, Carlton J. H.
A political and cultural history of modern Europe
Macmillan, 1932
 Buku Teks
Williams, E.N.
The ancien regime in Europe: government and society in the major state 1648-1789
Penguin Books, 1970
 Buku Teks