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- Gado, Mark. "All About Criminal Motivation." Crime Library. http://www.crimelibrary.com/criminal_mind/psychology/crime_motivation/4.html
- Le Page, Michael. "The ancestor within." New Scientist. 1/13/2007. Vol. 193 Issue 2586, p 28-33.
- Miller, Brandon. "Top 10 Useless Limbs (and Other Vestigial Organs)." LiveScience. http://www.livescience.com/animals/top10_vestigial_organs.html
- Theobald, Douglas. "Part 2: Past History." 29+ Evidences for Macroevolution. TalkOrigins. http://www.talkorigins.org/faqs/comdesc/section2.html#atavisms