^Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN978-1-4214-0135-5. ("Hallowell", p. 114).
^"Hallowell". The Reptile Database. www.reptile-database.org.
^Beolens, Bo; Watkins, Michael; Grayson, Michael (2013). The Eponym Dictionary of Amphibians. Exeter, England: Pelagic Publishing Ltd. (Kindle edition).
^Cope ED (1862). "On some new and little known American ANURA". Proc. Acad. Nat. Sci. Philadelphia14: 151-159. ("... dedicated to the memory of the late Dr. Edward Hallowell, whom the author holds in grateful and respectful recollection ...", p. 153).