Donelly, James H., author
Business Publications, 1984
Buku Teks
David, Fred R.
Merill, 1989
Buku Teks
rogers, Bill
Paul Chapman Publishing, 1995
Buku Teks
Roethlisberger, FJ
HArvard Univ.Press, 1970
Buku Teks
Schermerhorn, John R., author
John Wiley & Sons, 1993
Buku Teks