Maria, Alberto Santa
Kluwer Law International, 1996
Buku Teks
STBS , 1991
Buku Teks
Medhurst, David, author
Blackwell Scientific Publications, 1994
Buku Referensi
Shaw, Josephine, author
Macmillan, 1993
Buku Teks
Groves, Peter J., author
Cavendish, 1995
Buku Teks