APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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