Byers, Bruce E., Michael Richardson, and Daniel W. Brauning. 2013. “Chestnut-sided Warbler (Setophaga pensylvanica).” 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/chswar doi: 10.2173/bna.190