Gaya APA
Porter, Michael E.,. (1985).
Competitive advantage: creating and sustaining superior performance .
New York:
The Free Press.
Gaya Chicago
Porter, Michael E.,.
Competitive advantage: creating and sustaining superior performance.
New York:
The Free Press,
1985.
print.
Gaya MLA
Porter, Michael E.,.
Competitive advantage: creating and sustaining superior performance.
New York:
The Free Press,
1985.
print.
Gaya Turabian
Porter, Michael E.,.
Competitive advantage: creating and sustaining superior performance.
New York:
The Free Press,
1985.
print.