1. Williams, Bruce R., Technology, Investment and Growth (Chapman & Hall, Ltd, 1967 ).
2. Woodward, Joan, Management and Technology, Problems of Progress in Industry, no. 3 ( London: Department of Scientific and Industrial Research, 1958 ).
3. Mansfield, Edwin, Industrial Research and Technological Innovation (New York: W. W. Norton & Co., Inc., 1968 ).
4. Ray, G. F., ‘The Diffusion of New Technology. A Study of Ten Processes in Nine Industries’, National Institute Economic Review (Mar 1969), pp. 40–83.
5. OECD, Gaps in Technology, Comparisons between Member Countries in Education, Research & Development, Technological Innovation, International Economic Exchanges (Paris, 1970 ).