Scaphiopus holbrookii, commonly known as the eastern spadefoot, is a species of American spadefoot toad (family Scaphiopodidae) endemic to the eastern United States. It is not considered a true toad, with Bufonidae being the family of "true toads".[2][1][3][4]
^Moran, Katherine, and Charles E. Button. “A GIS model for identifying Eastern spadefoot toad (scaphiopus holbrookii) habitat in Eastern Connecticut.” Applied Geography, vol. 31, no. 3, July 2011, pp. 980–989, https://doi.org/10.1016/j.apgeog.2011.01.004.
^Frost, Darrel R. (2015). "Scaphiopus holbrookii (Harlan, 1835)". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 4 January 2016.