ISBN 9780471326441. University of Iowa. Researchers determine age for last known settlement by a direct ancestor to modern humans. Nature. 2019-12-18. (原始内容存档于2020-01-08)
"The Ancestor's Tale(英语:Ancestor's Tale)", Weidenfeld and Nicolson (London), (2004). DeSilva, J., “First Steps: How Upright Walking Made Us Human” Harper