(en) Geoffrey E. Hill, « Plumage coloration is a sexually selected indicator of male quality », Nature, vol. 350, no 6316, , p. 337–339 (ISSN0028-0836, DOI10.1038/350337a0)
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(en) Geoffrey E. Hill, « Plumage coloration is a sexually selected indicator of male quality », Nature, vol. 350, no 6316, , p. 337–339 (ISSN0028-0836, DOI10.1038/350337a0)