Wyatt, Valerie E., and Charles M. Francis. 2002. “Rose-breasted Grosbeak (Pheucticus ludovicianus).” 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/robgro doi: 10.2173/bna.692