Scoles, Eugene F., author
West Publishing, 1967
Buku Teks
Foote, Caleb, author
Little, Brown, 1976
Buku Teks
Barendt, E. M., author
Pearson, 2000
Buku Teks
Dickinson, Edwin D.
The Foundation Press, Inc, 1950
Buku Teks
Tabb, William Murray, author
Michie, 1992
Buku Teks