Cetron, M. J. (1969). Technological forecasting: A practical approach. Technology Forecasting Institute.
Chicago-viite (17. p.)Cetron, Marvin J. Technological Forecasting: A Practical Approach. New York: Technology Forecasting Institute, 1969.
MLA-viite (8. p.)Cetron, Marvin J. Technological Forecasting: A Practical Approach. Technology Forecasting Institute, 1969.
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