Benton, Michael. "Accuracy of Fossils and Dating Methods." ActionBioscience. Jan. 2001. Web. 06 Oct. 2016.
"The Flow of History." FC1: Biological, Cultural, and Technological Evolution in History. Web. 05 Oct. 2016.
Reardon, Sara. "Alive! Mammals Survived Toba’s Super-volcanic Winter." New Scientist. 25 July 2013. Web. 05 Oct. 2016.
Grabianowski, Ed. "Extinction Events That Almost Wiped Out Humans." Io9. 25 Mar. 2010. Web. 05 Oct. 2016.
Krulwich, Robert. "How Human Beings Almost Vanished From Earth In 70,000 B.C." NPR. 2012. Web. 05 Oct. 2016.
Kane, Sean. "The Human Race Once Came Dangerously Close to Dying out — Here's How It Changed Us." Tech Insider. 18 Mar. 2016. Web. 06 Oct. 2016.
"Meet the Human Ancestor Who Walked Earth 4 Million Years Ago." The Independent. 02 Oct. 2009. Web. 05 Oct. 2016.
Boeree, C. George, Dr. "Human Evolution." Human Evolution. Web. 05 Oct. 2016.
Smithsonian's National Museum of Natural History. "Human Evolution by The Smithsonian Institution's Human Origins Program." Human Evolution by The Smithsonian Institution's Human Origins Program. 01 Mar. 2010. Web. 05 Oct. 2016.
All digital images used in this educational project were taken from the website of the Smithsonian's National Museum of Natural History:
Smithsonian's National Museum of Natural History. Artist's Interpretation of Human Species. Digital image. 01 Mar. 2010. Web. 6 Oct. 2016.