West Publishing Co, 1987
Buku Teks
Weiler, Paul C. , author
West, 2011
Buku Teks
Uchtmann, Donald L.
Mc-Graw Hill, 1981
Buku Teks
Larsen, Paul B., author
Martinus Nijhoff pub., 2012
Buku Teks
Andrews, William D., 1931-, author
Aspen Law & Business, 1973
Buku Teks