Laski, Harold J.
George Allen and Unwin, 1959
Buku Teks
Sweezy, Paul M. (Paul Marlor), 1910-2004
McGraw-Hill, 1949
Buku Teks
edited by Richard M. Ketchum
Dutton , 1955
Buku Teks
Carr, Edward Hallet
Macmillan, 1950
Buku Teks
Wilson, Edmund, 1895-1972
Doubleday & Co., 1972
Buku Teks