Dyfyniad APA

PORTER MICHAEL E. (1980). COMPETITIVE STRATEGY TECHNIQUES. FREE PRESS.

Dyfyniad Arddull Chicago

PORTER MICHAEL E. COMPETITIVE STRATEGY TECHNIQUES. LONDON: FREE PRESS, 1980.

Dyfyniad MLA

PORTER MICHAEL E. COMPETITIVE STRATEGY TECHNIQUES. FREE PRESS, 1980.

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