Gaya APA
Porter, Michael E. (1985).
Competitive advantage .
New York:
The Free Press.
Gaya Chicago
Porter, Michael E.
Competitive advantage.
New York:
The Free Press,
1985.
Text.
Gaya MLA
Porter, Michael E.
Competitive advantage.
New York:
The Free Press,
1985.
Text.
Gaya Turabian
Porter, Michael E.
Competitive advantage.
New York:
The Free Press,
1985.
Print.