1. Joseph A. Schumpeter, Business Cycles: A Theoretical, Historical and Statistical Analysis of the Capitalist Process, 2 vols., New York: McGraw-Hill, 1939;
2. Abbott Payson Usher, A History of Mechanical Inventions, Cambridge, Mass.: Harvard University Press, rev. ed., 1954;
3. Jacob Schmookler, Inventions and Economic Growth, Cambridge, Mass.: Harvard University Press, 1966
4. Jacob Schmookler, Patents, Invention and Economic Change, Cambridge, Mass.: Harvard University Press, 1972;
5. Nathan Rosenberg, Technology and American Economic Growth, New York: Harper, 1972