Morse, Douglass H., and Alan F. Poole. 2005. “Black-throated Green Warbler (Setophaga virens).” 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/btnwar doi: 10.2173/bna.55