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Dyfyniad Arddull ChicagoMAKRIDAKIS, Spyros G. Forecasting, Planning, and Strategy for the 21 St Century. New York: The Free Press, 1990.
Dyfyniad MLAMAKRIDAKIS, Spyros G. Forecasting, Planning, and Strategy for the 21 St Century. The Free Press, 1990.
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