Holmes, Richard T., Nicholas L. Rodenhouse, and T. Scott Sillett. 2005. “Black-throated Blue Warbler (Setophaga caerulescens).” 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/btbwar doi: 10.2173/bna.87