Ford, H.A.J., author
Butterworth, 1995
Buku Teks
Hamilton, Robert W., author
West Publishing, 1996
Buku Teks
Hawkins, David F., author
Dow Jones/Irwin, 1972
Buku Teks
Dodd, E. Merrick, author
Foundation Press, 1951
Buku Teks
Soderquist, Larry D., author
Michie, 1991
Buku Teks