Gray, Edmund R., author
Management : the competitive edge
Macmillan, 1990
 Buku Teks
Porter, Michael E., author
Competitive advantage / Michael E. Porter
Free Press, 1985
 Buku Teks
Luthans, Fred, author
Psychological capital : developing the human competitive edge
Oxford University Press, 2007
 Buku Teks
Porter, Michael E., author
Competitive advantage : creating and sustaining superior performance
The Free Press , 1985
 Buku Teks
Porter, Michael E., author
Competitive strategy : techniques for analyzing industries and competitors
Free Press, 1980
 Buku Teks
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