Keefe, William J., author
Prentice-Hall, 1994
Buku Teks
Williams, David, author
Sweet & Makwell, 2000
Buku Teks
Leslie, Douglas L., author
West Publishing, 1992
Buku Teks
Champion, Walter T, author
WEST , 2009
Buku Teks
Epstein, David G., author
West Publishing, 1981
Buku Teks