-Ankel-Simons, Friderun (2007). "Chapter 8: Postcranial Skeleton". Primate Anatomy (3rd ed.). Academic Press. p. 345 (1st paragraph what is our thumb and what makes it diffrent from the rest of our fingers)
-Young, Richard W. (January 2003). ( Evolution of the human hand)
- Suzanne Kemmer Last modified Feb 7 2008(http://www.ruf.rice.edu/~kemmer/Evol/opposablethumb.html)
- G. Stolyarov II (http://www.associatedcontent.com/article/261705/the_importance_and_evolutionary_significance.html?)
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