Cleaver, Tony, author
Routledge, 1997
Buku Teks
edited by Kenichi Ohmae
A Harvard Business Review Book, 1995
Buku Teks
Henderson, Hazel, author
Kumarian Press, 1999
Buku Teks
Vaughn, Donald E., author
Prentice-Hall, 1997
Buku Teks
edited by Michael E. Porter
Harvard Business School Press , 1986
Buku Teks