North, Peter
Claredon Press, 1993
Buku Teks
Gutteridge, Harold Cooke
Jackson, Son & Company, 1951
Buku Teks
chesehire
Buku Teks
Svantesson, Dan Jerker B.
Kluwer Law International, 2007
Buku Teks SO
Cheshire, G. C.
At The Clarendon Press, 1952
Buku Teks