Cetron, M. J. (1969). Technological forecasting: A practical approach. New York: Technology Forecasting Institute.
Παραπομπή Chicago StyleCetron, Marvin J. Technological Forecasting: A Practical Approach. New York: Technology Forecasting Institute, 1969.
Παραπομπή MLACetron, Marvin J. Technological Forecasting: A Practical Approach. New York: Technology Forecasting Institute, 1969.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.