Michael Porter: what is strategy? (Competitive strategy analysis). 2002. Thinkers.
Competitive Strategy
Michael Porter, Competitive Strategy: Techniques for Analyzing Industries and Competitors, (The Free Press: 1980)
Porter's Five Forces
Michael E. Porter, "Corporate Strategy: the State of Strategic Thinking," Economist, May 23, 1998, 21-22, 27-28
Symantec
"Competitive Strategy and Real Estate Development" 22 Aug.2006 < http://www.isc.hbs.edu/Porter_Strategy_Real_Estate1.pdf#search=%22strategy%20 is%20about%20positioning%20within%20an%20attractive%20industry%2C%20Porter%22 >
Porter's Five Forces
QMBA. (2003). "Porters Generic Strategies." QMBA. 6, November, 2004, http://www.quickmba.com/strategy/gereic.shtml
Porter’s Five Forces Model