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McGraw, Kevin; Hill, Geoffrey; Parker, Robert S. (2005). "The physiological costs of being colourful: nutritional control of carotenoid utilization in the American goldfinch, "Carduelis tristis". Animal Behaviour. 69 (3): 653-660. doi:10.1016/j.anbehav.2004.05.018.
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Bent, A. C.; Cleveland, Arthur; et al. (1968). "American Goldfinch Carduelis tristis"Smithsonian Institution United States National Museum Bulletin. 237 (1): 447-466. Archived from the original on 1 January 2008. Retrieved 4 February 2008.
McGraw, Kevin; Hill, Geoffrey; Parker, Robert S. (2005). "The physiological costs of being colourful: nutritional control of carotenoid utilization in the American goldfinch, "Carduelis tristis". Animal Behaviour. 69 (3): 653-660. doi:10.1016/j.anbehav.2004.05.018.
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