APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.