Kitzinger, Uwe W.
The politics and economics of European integration : Britain, Europe, and the United States
Frederick A. Praeger, 1963
 Buku Teks SO
Cook, Chris
European political facts 1848 -1918
Macmillan, 1978
 Buku Referensi
Lenin, Vladimir I.
Collected Works Volume 13 June 1907 - April 1908
Foreign Languages Publishing House, 1962
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Ward, Barbara
West-Europa in het Nauw / Barbara Ward
H. P. Leopolds Uitgeversmij N.V., 1949
 Buku Teks
Politics in western Europe / edited, Gerald A. Dorfman, Peter J. Duignan
Hoover Institution Press, 1988
 Buku Teks SO