McRae, Hamish, author
Harvard Business School Press, 1995
Buku Teks
edited by Immanuel Lim
Discern Pub. House, 2010
Buku Teks
Pelanduk Publications, 1996
Buku Teks
Hawken, Paul
Little, Brown and company , 1999
Buku Teks
Aburdene, Patricia, author
Villad Books, 1992
Buku Teks