Dentreves, A.P.
Natural law : an introduction to legal philosophy
Hutchinson`s University Library, 1951
 Buku Teks
A Companion to philosophy of law and legal theory
edited by Dennis M. Patterson
Blackwell, 1999
 Buku Teks
A companion to philosophy of law and legal theory
edited by Dennis Patterson
Blackwell, 1996
 Buku Teks
Cohan, Morris R.
Law and the social order essays in legal philosophy
Transactio Books, 1982
 Buku Teks
Rommen, Heinrich A.
The natural law a study in legal and social history and philosophy
Liberty Fund Indianapolis, 1998
 Buku Teks