Shriver, W. Gregory, Thomas P. Hodgman, and Alan R. Hanson. 2011. “Nelson’s Sparrow (Ammodramus nelsoni).” 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/nstspa doi: 10.2173/bna.719