Central Chambers Law Corporation
Sweet & Maxwell Asia, 2012
Buku Teks
Dobbyn, John F., author
West Publishing, 1996
Buku Teks
Siahaan, Sari M. R., author
Universitas Indonesia, 2004
UI - Skripsi (Membership)
Willborn, Steven L.
The Michie Company, 1993
Buku Teks
Goode, Roy, author
Penguin Books, 2004
Buku Teks