Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.