Kamm, F.M.
Oxford University Press, 1992
Buku Teks
Kelsen, Hans, author
Alumni, 1982
Buku Teks
Kelsen, Hans, author
Alumni, 2006
Buku Teks
Rommen, Heinrich A.
Liberty Fund Indianapolis, 1998
Buku Teks
Rachels, James, 1941-2003, author
McGraw-Hill , 2012
Buku Teks