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Dyfyniad Arddull ChicagoPRIMOZIC, Kenneth I., Edward A. PRIMOZIC, and Joe LEBEN. Strategic Choices: Supremacy, Survival, or Sayonara. New York: McGraw Hill, 1991.
Dyfyniad MLAPRIMOZIC, Kenneth I., et al. Strategic Choices: Supremacy, Survival, or Sayonara. McGraw Hill, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.