Kelsen, Hans
Clarendon Press Oxford, 1992
Buku Teks
Finch, John
Sweet & Maxwell, 1970
Buku Teks
Ward, Ian
Routledge. Cavendish. Taylor & Francis Group, 2004
Buku Teks
Joseph, Raz
Oxford Clarendon Press, 1970
Buku Teks
Raz, Joseph
Clarendon Press, 1970
Buku Teks