Mill, John Stuart
E.P. Dutton and Company, 1955
Buku Teks
Mill, John Stuart
Yayasan Obor Indonesia, 1996
Buku Teks
Laski, Harold J., author
George Allen and Unwin, 1948
Buku Teks
Laski, Harold J., author
Penguin Books, 1937
Buku Teks
Dahrendorf, Ralf, author
Stanford University Press, 1975
Buku Teks