Harvard Business School Press, 2001
Buku Teks
Bengtsson, Ann McDonagh, author
Gower, 1992
Buku Teks
Johnson, Hazel J., author
Financial Times Prentice Hall, 1999
Buku Teks
Miller, Edwin L., author
John Wiley & Sons, 2008
Buku Teks
Oesterle, Dale A.
West Publishing Co., 1991
Buku Teks