Walters, Eric L., Edward H. Miller, and Peter E. Lowther. 2002. “Yellow-bellied Sapsucker (Sphyrapicus varius).” 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/yebsap doi: 10.2173/bna.662