Penggayaan APA
PORTER, Michael E.. (1980).
Competitive strategy: .
New York:
The Free Press.
Chicago Style
PORTER, Michael E..
Competitive strategy:.
New York:
The Free Press,
1980.
Buku.
MLA Style
PORTER, Michael E..
Competitive strategy:.
New York:
The Free Press,
1980.
Buku.
Turabian Style
PORTER, Michael E..
Competitive strategy:.
New York:
The Free Press,
1980.
Buku.