^Why Do Europeans Have So Many Hair and Eye Colors? [1] (页面存档备份,存于互联网档案馆)
^Heather L. Norton, Rick A. Kittles, Esteban Parra, Paul McKeigue, Xianyun Mao, Keith Cheng, Victor A. Canfield, Daniel G. Bradley, Brian McEvoy and Mark D. Shriver (December 11, 2006) Genetic Evidence for the Convergent Evolution of Light Skin in Europeans and East Asians Oxford Journals存档副本(PDF). [2006-12-20]. (原始内容(PDF)存档于2007-06-16).