Kuper, Adam
Routledge, 1996
Buku Teks SO
Waldrep, Lee W.
John Wiley & Sons, 2010
Buku Teks SO
Clements, John, 1946-
John Wiley & Sons, 1994
Buku Teks
Pedley, Paul
Facet Publishing, 2005
Buku Teks SO
Ritter, Lennart
Kluwer Law International, 1991
Buku Teks