Cambridge University Press, 1994
Buku Referensi
A.A. BAlkema, 2000
Buku Teks
Fenwick, Charles G., author
Appleton-Century-Crofts, 1948
Buku Teks
Wallace, Rebecca M. M., author
Sweet & Maxwell, 1997
Buku Teks
Carter, Barry E.
Aspen Law & Business, 1999
Buku Teks