Citazione Stile APA (7a Edizione)

PORTER MICHAEL E. (1980). COMPETITIVE STRATEGY: TECHNIQUES FOR ANALYSING ...COMPETITORS. FREE PRESS.

Citazione stile Chigago Style (17a edizione)

PORTER MICHAEL E. COMPETITIVE STRATEGY: TECHNIQUES FOR ANALYSING ...COMPETITORS. NEW YORK LONDON: FREE PRESS, 1980.

Citatione MLA (9a ed.)

PORTER MICHAEL E. COMPETITIVE STRATEGY: TECHNIQUES FOR ANALYSING ...COMPETITORS. FREE PRESS, 1980.