- Carson, Rachael, Silent Spring, Houghton Mifflin, Boston, Massachusetts, 1962.
- Osborn, Fairfield, Our Plundered Planet, Little, Brown, and Company, Boston, Massachusetts, 1948.
- Saveland, R. N., World Resources, Eastern Hemisphere, Ginn-Xerox, Boston, Massachusetts, p. 246.
- Thompson, J. L.; Thompson, B. R., “The Concept of Conservation Needs Revision,” The Journal of Geography, pp. 516–517, December 1969.
- Vogt, William, Road to Survival, W. Sloan Associates, 1948.
- White, C. L.; Renner, G. F., Human Geography: An Ecological Study of Society. Appleton-Century-Crofts, New York, New York, p. v, 1948.
Environmental Education
Volume 2, 1970 - Issue 2