Peter Ferdinand Drucker (2006). “Classic Drucker: Essential Wisdom of Peter Drucker from the Pages of Harvard Business Review”, p.196, Harvard Business Press
"Smarter Branding Without Breaking the Bank: Five Proven Marketing Strategies You Can Use Right Now to Build Your Business at Little Or No Cost". Book by Brenda Bence (p. 91), November 7, 2011.
"Smarter Branding Without Breaking the Bank: Five Proven Marketing Strategies You Can Use Right Now to Build Your Business at Little Or No Cost". Book by Brenda Bence (p. 91), November 7, 2011.