Barendt, E. M., author
Pearson, 2000
Buku Teks
Dickinson, Edwin D.
The Foundation Press, Inc, 1950
Buku Teks
Doelle, Meinhard, author
Carswell, 2009
Buku Teks
Kauper, Paul G., author
Little, Brown, 1966
Buku Teks
Barnes, David W., author
West Publishing , 1992
Buku Teks