Cetron, M. J. (1969). Technological forecasting: A practical approach. New York: Technology Forecasting Institute.
Dyfyniad Arddull ChicagoCetron, Marvin J. Technological Forecasting: A Practical Approach. New York: Technology Forecasting Institute, 1969.
Dyfyniad MLACetron, Marvin J. Technological Forecasting: A Practical Approach. New York: Technology Forecasting Institute, 1969.
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