Wheelwright, Nathaniel T., and James D. Rising. 2008. “Savannah Sparrow (Passerculus sandwichensis).” 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/savspa doi: 10.2173/bna.45