Ehrlich, P. R. (1971). How to be a survivor: A plan to save spaceship earth. New York: Ballantine Books.
Chicago Stili AlıntıEhrlich, Paul R. How to Be a Survivor: A Plan to Save Spaceship Earth. New York: Ballantine Books, 1971.
MLA AlıntıEhrlich, Paul R. How to Be a Survivor: A Plan to Save Spaceship Earth. New York: Ballantine Books, 1971.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..