Holden, Robert, author
Laurence King Publishing, 1996
Buku Referensi
Colquhoun, Ian, author
B.T. Batsford, 1991
Buku Referensi
edited by David L. Sills
Macmillan and The Free Press, 1968
Buku Referensi
Kluwer Law International , 1996
Buku Teks
K. G. Saur, 1986
Buku Referensi