中期旧石器時代
Contributed by Richard B. Potts. Archived 2009-11-01.
↑ Felipe Fernandez Armesto (2003). Ideas that changed the world. Newyork: Dorling Kindersley limited. p. 400. ISBN 978-0-7566-3298-4 ;
1 2 3 4 Hillary Mayell. “When Did "Modern" Behavior Emerge in Humans?”. National Geographic News. 2008年2月5日閲覧。
↑ Boehm, Christopher (2009). Hierarchy in the Forest: The Evolution of Egalitarian Behavior. Harvard University Press. ISBN 978-0-674-02844-9. https://books.google.com/books?id=ljxS8gUlgqgC&pg=PA197 , p. 198
1 2 Boehm, Christopher (2009). Hierarchy in the Forest: The Evolution of Egalitarian Behavior. Harvard University Press. ISBN 978-0-674-02844-9. https://books.google.com/books?id=ljxS8gUlgqgC&pg=PA197 , p.