Finch, John, author
Sweet & Maxwell, 1974
Buku Teks
Kelsen, Hans, author
Clarendon Press Oxford, 1992
Buku Teks
Finch, John, author
Sweet & Maxwell, 1970
Buku Teks
Posner, Richard A.
Harvard University Press, 1999
Buku Teks
Posner, Richard A., author
Harvard University Press, 2002
Buku Teks