References
- Paul R.EhrlichThe population bomb1968Ballantine BooksNew York, NY
- Paul R.EhrlichAnne H.EhrlichThe population explosion1990Simon and ShusterNew York, NY
- Thomas R.MalthusAn essay on the principle of population1798Richard D. Irwin, IncHomewood, IL (1963)
- Julian L.SimonThe ultimate resource1981Princeton University PressPrinceton, NJ
- AdamSmithAn inquiry into the nature and causes of the wealth of nations1776Random House, Modern Library EditionNew York, NY1937