Franklin, mark A.
The Foundation Press,Inc., 1988
Buku Teks
Howell, Rate A., author
Dryden Press, 1988
Buku Referensi
Epstein, David G., author
West Pub. Co, 1988.
Buku Teks
The Foundation Press, Inc., 1975
Buku Teks
West Publishing Co, 1987
Buku Teks