APA (7 ম সংস্করণ) উদ্ধৃতি

PORTER, M. E. (1980). Competitive strategy: Techniques for analyzing industries and competitors. The Free Press.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

PORTER, Michael E. Competitive Strategy: Techniques for Analyzing Industries and Competitors. New York: The Free Press, 1980.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

PORTER, Michael E. Competitive Strategy: Techniques for Analyzing Industries and Competitors. The Free Press, 1980.