Lyons, David, author
Clarendon Press, 1991
Buku Teks
Postema, Gerald J., author
Clarendon Press, 1986
Buku Teks
Kelly, Paul J., author
Oxford University Press, 1990
Buku Teks
Rommen, Heinrich A.
Liberty Fund Indianapolis, 1998
Buku Teks
edited by R.M. Dworkin
Oxford University Press, 1977
Buku Teks