Davidson, Kenneth M.
West Publishing Company, 1974
Buku Teks
Whaley, Douglas J.
Little, Brown and Company, 1991
Buku Teks
Weiler, Paul C. , author
West, 2011
Buku Teks
Larsen, Paul B., author
Martinus Nijhoff pub., 2012
Buku Teks
Andrews, William D., 1931-, author
Aspen Law & Business, 1973
Buku Teks