Whisler, Thomas L.
Dow Jones-Irwin, 1984
Buku Teks
Burtchett, Floyd Franklin
Clifford Milton, 1964
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
The New American Library, 1964
Buku Teks
Partner, Simon, author
New Jersey, Prentice Hall1991,
Buku Referensi
Butters, J. Keith, author
Harvard University Graduate School of Business Administration, 1949
Buku Teks