1. H. Brookset al.:Science, Growth and Society: A New Perspective, p. 21, OECD, Paris, 1971.
2. President’s Science Advisory Committee:The World Food Problem, Report of the Panel on the World Food Supply, U.S.G.P.O., May 1967.
3. Lester R. Brown:Foreign Affairs, New York, July 1968, vol. 46, no. 4, pp. 688–98; C. R. Wharton, Jr.:Foreign Affairs, April 1969, vol. 47, no. 3, pp. 464–76.
4. Jay W. Forrester:World Dynamics, Wright-Allen Press, Cambridge, 1971.
5. P.M. Hauser, ed.:The Population Dilemma, p. 99 (Chart 3), Prentice Hall Inc., Englewood Cliffs, N. J., 1963.