4T. W. Schaltz: "The Value of the Ability to Deal With Disequilibria", Journal of Economic Literature, 1975, vol. 13.p. 828.
5Schultz,T. W. , 1956, Agriculture and the Application of Knowledge ,A look to the Future, W, K, Kellogg Foundation,Battle Creek :54 - 78.
6Denison, E, F. , 1962 ,The sources of Economic Growth in the United States and the Alternatives before Us, New York:Committee for Economic Development.
7Barro, R, J. , 1991, Economic Growth in a Cross Section or Countries. Quarterly Journal of Economics 106 ( 2 ) :407 - 443.