Gaya APA
Porter, M, E. (2007).
Strategi Bersaing ( Competitive Strategy) : Teknik Menganalisis Industri dan Industri .
Batam:
Karishma Publishing.
Gaya MLA
Porter, Michael, E..
"Strategi Bersaing ( Competitive Strategy) : Teknik Menganalisis Industri dan Industri".
Batam:
Karishma Publishing,
2007.
Text.