Gardali, Thomas, and Grant Ballard. 2000. “Warbling Vireo (Vireo gilvus).” 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/warvir doi: 10.2173/bna.551