American Bar Association, 1978
Buku Teks
Leathley, Christian, author
Kluwer, 2007
Buku Teks
Janine M. Ubink, editor
Leiden University Press, 2009
Buku Teks
St.Martin`s Press, 1971
Buku Teks
edited by Eduardo P. Archetti
MacMillan Education, 1987
Buku Teks