Herkert, James R., Peter D. Vickery, and Donald E. Kroodsma. 2002. “Henslow’s Sparrow (Ammodramus henslowii).” 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/henspa doi: 10.2173/bna.672