1. “Statistical Abstract of the United States, 1961, 1962 & 1963,” U. S. Department of Commerce.
2. Population;Kingsley Davis-Scientific American,1963
3. “Basic Economic Projections-U. S. Population, 1965–1980” by Balestro and Rao, Stanford Research Institute, Menlo Park, Calif.
4. “The Population Crisis and the Use of World Resources,” World Acad. of Art and Science,1964
5. Resources in America's Future;Landsberg,1963