S. Ito et K. Wakamatsu, « Diversity of human hair pigmentation as studied by chemical analysis of eumelanin and pheomelanin », Journal of the European Academy of Dermatology and Venereology, vol. 25, no 12, , p. 1369–1380 (PMID22077870, DOI10.1111/j.1468-3083.2011.04278.x, S2CID5121042)
S. Ito et K. Wakamatsu, « Diversity of human hair pigmentation as studied by chemical analysis of eumelanin and pheomelanin », Journal of the European Academy of Dermatology and Venereology, vol. 25, no 12, , p. 1369–1380 (PMID22077870, DOI10.1111/j.1468-3083.2011.04278.x, S2CID5121042)
S. Ito et K. Wakamatsu, « Diversity of human hair pigmentation as studied by chemical analysis of eumelanin and pheomelanin », Journal of the European Academy of Dermatology and Venereology, vol. 25, no 12, , p. 1369–1380 (PMID22077870, DOI10.1111/j.1468-3083.2011.04278.x, S2CID5121042)
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cogweb.ucla.edu
Frost, Peter. "Why Do Europeans Have So Many Hair and Eye Colors?" (summarizing Frost, P. 2006. European hair and eye color - A case of frequency-dependent sexual selection? Evolution and Human Behavior 27:85-103)