Penggayaan APA
PORTER, Michael E. (1990).
The competitive advantage of nations .
New York:
Free Press.
Chicago Style
PORTER, Michael E.
The competitive advantage of nations.
New York:
Free Press,
1990.
Buku.
MLA Style
PORTER, Michael E.
The competitive advantage of nations.
New York:
Free Press,
1990.
Buku.
Turabian Style
PORTER, Michael E.
The competitive advantage of nations.
New York:
Free Press,
1990.
Buku.