McClure, Rhyder, author
Brady, 1990
Buku Teks
Andersen, Dick, author
Erlangga, 1986
Buku Teks
Brigham, Eugene F., 1930-, author
Dryden Press, 1988
Buku Teks
Holt, Jack A., author
Richard D. Irwin , 1990
Buku Teks
Osgood, William R.
Prentice-Hall, 1984
Buku Teks