Porter, M. E. (1980). Competitive strategy. The Free Press.
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Dyfyniad Arddull Chicago
Porter, Michael E. Competitive Strategy. London: The Free Press, 1980.
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Dyfyniad MLA
Porter, Michael E. Competitive Strategy. The Free Press, 1980.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.