Porter, Michael E.
Competitive strategy : techniques for analyzing industries and competitors
Free Press, 1980
 Buku Teks SO
Pitts, Robert A.
Strategic management: building and sustaining competitive advantage
South-Western College Publishing, 2000
 Buku Teks SO
Porter, Michael E.
Competitive advantage
Free Press, 1985
 Buku Teks SO
Gray, Edmund R.
Management : the competitive edge
Macmillan, 1990
 Buku Teks
Porter, Michael E.
The competitive advantage of nations
The Free Press , 1990
 Buku Teks SO