Prasannan
Cadco Management services, 1982
Buku Teks
Kember. N.F., author
Edward Arnold, 1984
Buku Teks
Watson, Hugh J., author
John Wiley & Sons, 1981
Buku Teks
O`Dell, Jerry W., author
TAB Books, 1984
Buku Teks
Eisner, Howard, author
Prentice-Hall, 1988
Buku Teks