Gerstner, Merrill H.
Amacom , 1974
Buku Teks
Mackenizie, John
Illinois: Dow Jones-Irwin, 1989
Buku Teks
Hon, David, author
John Wiley & Sons, 1980
Buku Teks
Whipps, Roy, author
Business Books, 1969
Buku Teks
Munter, Mary, author
Prentice-Hall, 2002
Buku Teks