Last, John M. "Zero Population Growth." Healthline. N.p. , 2002. Web. 5 Oct. 2009. <"Archived copy". Archived from the original on July 22, 2011. Retrieved October 7, 2009.{{cite web}}: نگهداری یادکرد:عنوان آرشیو به جای عنوان (link)
web.archive.org
Last, John M. "Zero Population Growth." Healthline. N.p. , 2002. Web. 5 Oct. 2009. <"Archived copy". Archived from the original on July 22, 2011. Retrieved October 7, 2009.{{cite web}}: نگهداری یادکرد:عنوان آرشیو به جای عنوان (link)