Paul L.C. Torremans, editor
Kluwer Law International, 2008
Buku Teks
Selby, David, author
Cambridge University Press, 1988
Buku Teks
edited by George Clack
[publisher not identified], 1998
Buku Teks
Nickel, James W., author
Blackwell , 2007
Buku Teks
Unesco, 1970
Buku Teks