Wootton, J. Timothy. 1996. “Purple Finch (Haemorhous purpureus).” The Birds of North America, edited by Paul G. Rodewald. Ithaca: Cornell Lab of Ornithology. Retrieved from the Birds of North America: https://birdsna.org/Species-Account/bna/species/purfin doi: 10.2173/bna.208