Scoles, Eugene F., author
West Publishing, 1992
Buku Teks
Mayss, Abla J., author
Cavendish, 1994
Buku Teks
Ehrenzweig, Albert A., author
West Publishing, 1959
Buku Teks
Graveson, R.H.
Sweet & Maxwell, 1969
Buku Teks
Nadelmann, Kurt H., author
Martinus Nijhoff, 1972
Buku Teks