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  • "Chimps on treadmills offer evolution insights." Reuters. CNN.com. July 17, 2007. http://www.cnn.com/2007/TECH/science/07/17/chimps.on.treadmills.reut/
  • "Introduction to Archaeology: Glossary." Archaeological Institute of America. http://www.archaeological.org/webinfo.php?page=10299#h
  • Connor, Steve. "The truth about why we walk on two legs: it saves energy." The Independent. July 17, 2007. http://news.independent.co.uk/sci_tech/article2776141.ece
  • Knight, Meredith. "Walking Tall: Why Did Humans Switch From Four- to Two-Legged Strides?" Scientific American. July 17, 2007. http://www.sciam.com/article.cfm?articleID=D4EDD3B5-E7F2-99DF-3780F5F065506592&chanID=sa007
  • Mayell, Hillary. "Fossil Pushes Upright Walking Back 2 Million Years, Study Says." National Geographic News. Sept. 2, 2004. http://news.nationalgeographic.com/news/2004/09/0902_040902_upright_hominid.html
  • Schmid, Randolph E. "Why We Walk on Two Legs: It's Easier." Associated Press. Discovery News. July 17, 2007. http://dsc.discovery.com/news/2007/07/17/walking_arc.html?category=archaeology
  • Sockol, Michael D., Raichlen, David A. and Pontzer, Herman. "Chimpanzee locomotor energetics and the origin of human bipedalism." Proceedings of the National Academy of Sciences. July 16, 2007. http://www.pnas.org/cgi/content/abstract/0703267104v1?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=walking+upright&searchid=1&FIRSTINDEX=0&resourcetype=HWCIT
  • Waldman, Dan. "Monkey apes humans by walking on two legs." Associated Press. MSNBC.com. July 21, 2004. http://www.msnbc.msn.com/id/5479501/