Carrell, Michael R., author
Prentice-Hall, 2001
Buku Teks
Taylor, Benjamin J., author
Prentice-Hall, 1987
Buku Teks
Merrifield, Leroy S., author
Michie, 1994
Buku Teks
Leslie, Douglas L., author
Little, Brown and Company, 1981
Buku Teks
Leslie, Douglas L., author
Little, Brown, 1979
Buku Teks