Davis, F.T.
Institute for Business Planning, 1981
Buku Teks
Cook, Mary F., author
Prentice-Hall, 1997
Buku Referensi
Haner, F.T.
Winthrop Publisher, 1976
Buku Teks
Ronald, Dana M.
John Wiley & Sons, 1987
Buku Teks
Harvard Business School Press, 2001
Buku Teks