Ides, Allan, author
Aspen Law & Business, 2003
Buku Teks
Karlen, Delmar
West, 1972
Buku Teks
Blume, William Wirt
Prentice-Hall, 1955
Buku Teks
Prassel, Frank R., author
Goodyear, 1979
Buku Teks
Maguire, John MacArthur
Foundation Press,, 1978
Buku Teks