Παραπομπή σε μορφή APA (7η εκδ.)

PORTER, M. E. (1980). Competitive Strategy Techniques For Analyzing Industies And Competitors Michael E. Porter. the Free Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

PORTER, Michael E. Competitive Strategy Techniques For Analyzing Industies And Competitors Michael E. Porter. the Free Press, 1980.

Παραπομπή σε μορφή MLA (8th εκδ.)

PORTER, Michael E. Competitive Strategy Techniques For Analyzing Industies And Competitors Michael E. Porter. the Free Press, 1980.