O`rourke, Raymond
Palladian law Publishing Ltd., 1998
Buku Teks
Cuthbert, Mike
Cavendish Publishing Limited, 1993
Buku Teks
Belgium : R.H. Wijffels, 1972
Buku Teks
Jans, Jan H., author
Europa Law Publishing, 2000
Buku Teks
Blaipain, Roger, author
Kluwer Law International, 2008
Buku Teks