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McGraw K. J., Hill G. E., Stradi R., Parker R. S., The Influence of Carotenoid Acquisition and Utilization on the Maintenance of Species - Typical Plumage Pigmentation in Male American Goldfinches (Carduelis tristis) and Northern Cardinals (Cardinalis cardinalis) (abstract), in Physiological and Biochemical Zoology, vol. 74, n. 6, the University of Chicago Press, 2001, p. 843–852, DOI:10.1086/323797, PMID11731975. URL consultato il 6 novembre 2007.
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McGraw K. J., Hill G. E., Stradi R., Parker R. S., The Influence of Carotenoid Acquisition and Utilization on the Maintenance of Species - Typical Plumage Pigmentation in Male American Goldfinches (Carduelis tristis) and Northern Cardinals (Cardinalis cardinalis) (abstract), in Physiological and Biochemical Zoology, vol. 74, n. 6, the University of Chicago Press, 2001, p. 843–852, DOI:10.1086/323797, PMID11731975. URL consultato il 6 novembre 2007.
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