Bibliography

Dolphin, Lambert. "World Population Since Creation." Lambert Dolphin's Library. Web. 05 Jan. 2011. <http://ldolphin.org/popul.html>.

Kunzig, Robert. "Population 7 Billion." National Geographic Magazine. Jan. 2011. Web. 05 Jan. 2011. <http://ngm.nationalgeographic.com/2011/01/seven-billion/kunzig-text>.