Laski, Harold J.
Liberty in the modern state
George Allen and Unwin, 1948
 Buku Teks SO
Laski, Harold J.
Liberty in the modern state
Penguin Books, 1937
 Buku Teks SO
Mill, John Stuart
On liberty and utilitarianism
David Campbell Publisher, 1992
 Buku Referensi
Dahrendorf, Ralf
The new liberty: survival and justice in a changing world
Stanford University Press, 1975
 Buku Teks SO
Mill, John Stuart
Utilitarianism, liberty, and representative government
E.P. Dutton and Company, 1955
 Buku Teks SO