Ruth, Janet M. 2015. Status Assessment and Conservation Plan for the Grasshopper Sparrow (Ammodramus savannarum). Version 1.0. Lakewood, CO: U.S. Department of the Interior, Fish and Wildlife Service. https://www.fws.gov/mountain-prairie/species/birds/grasshoppersparrow/GRSP%20Status%20Assessment%20and%20Conservation%20Plan%20FINAL.pdf