Bonell, Michael
An International restatement of contract law
Transnational Juris Publications, 1994
 Buku Teks SO
Mill, John Stuart
On liberty and utilitarianism
David Campbell Publisher, 1992
 Buku Referensi
Handlin, Oscar
The dimensions of liberty
Atheneum, 1966
 Buku Teks SO
Walker, Marianne McGettigan
American law institute restatement of the law
American law Institute Publishers, 1995
 Buku Teks
Riley, Jonathan
Mill on liberty / Jonathan Riley
Routledge, 1998
 Buku Teks SO