Gaya APA
Porter, Michael E.. (1990).
The competitive advantage of nations .
New York:
Free Press.
Gaya Chicago
Porter, Michael E..
The competitive advantage of nations.
New York:
Free Press,
1990.
Text.
Gaya MLA
Porter, Michael E..
The competitive advantage of nations.
New York:
Free Press,
1990.
Text.
Gaya Turabian
Porter, Michael E..
The competitive advantage of nations.
New York:
Free Press,
1990.
Print.