Gill, Frank B., Ronald A. Canterbury, and John L. Confer. 2001. “Blue-winged Warbler (Vermivora cyanoptera).” 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/buwwar doi: 10.2173/bna.584