De Jong, Michael J. 1996. “Northern Rough-winged Swallow (Stelgidopteryx serripennis).” 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/nrwswa doi: 10.2173/bna.234