Watts, Bryan D. 2011. “Yellow-crowned Night-Heron (Nyctanassa violacea).” 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/ycnher doi: 10.2173/bna.161