Kortmann, C.A.J.M.
Kluwer Law International, 2007
Buku Teks SO
Barendt, E. M.
Oxford University Press, 1998
Buku Teks
Heringa, A.W.
Metro, 2009
Buku Teks SO
Stone, Geoffrey R.
Little, Brown and Company, 1991
Buku Teks SO
Wade, E.C.S. [Emlyn Capel Stewart]
Longmans Green, 1951
Buku Teks