1. D. J. De S. Price,Science since Babylon, New Haven, Connecticut, Yale University Press, 1961.
2. D. J. De S. Price,Little Science, Big Science, New York, Columbia University Press, 1963.
3. E. M. Rogers,Diffusion of Innovations, New York, Free Press of Glencoe, 1962.
4. J. S. Coleman, E. Katz, H. Menzel,Medical Innovations: A Diffusion Study, Indianapolis, Bobbs-Merrill, 1966.
5. D. Crane,Invisible Colleges: Diffusion of Knowledge in Scientific Communities, Chicago, The University of Chicago Press, 1972, p. 213.