Alfred L. Gardner. Curator of North American mammals and Chief of Mammal Section, National Biological Service, Smithsonian Institution, National Museum of Natural History, Washington, DC, USA
Banks, R. C., R. W. McDiarmid, and A. L. Gardner 1987-01-01. Resource Publication, no. 166. United States Department of the Interior Fish and Wildlife Service. Washington, D.C., USA. 79. . .
U. S. Fish and Wildlife Service 2009-12-03. Federal Register, vol. 74, no. 231. . . 63343-63366. . .
Wilson, Don E., and DeeAnn M. Reeder, eds. 1992-01-01. Mammal Species of the World: A Taxonomic and Geographic Reference, 2nd ed., 3rd printing. Smithsonian Institution Press. Washington, DC, USA. xviii + 1207. 1-56098-217-9. Corrections were made to text at 3rd printing.
Thorington, Richard W., Jr., and Robert S. Hoffman / Wilson, Don E., and DeeAnn M. Reeder, eds. 2005-10-01. Mammal Species of the World: A Taxonomic and Geographic Reference, 3rd ed., vol. 2. Johns Hopkins University Press. Baltimore, Maryland, USA. 754-818. 0-8018-8221-4. .
Wilson, Don E., and F. Russell Cole 2000-01-01. Common Names of Mammals of the World. Smithsonian Institution Press. Washington, DC, USA. xiv + 204. 1-56098-383-3. With contributions by Bernadette N. Graham, Adam P. Potter, and Mariana M. Upmeyer.
Thorington, Richard W., Jr., John L. Koprowski, Michael A. Steele, and James F. Whatton 2012-01-01. Squirrels of the World. Johns Hopkins University Press. Baltimore, Maryland, USA. vii + 459. 1-4214-0469-9. .
Wilson & Reeder, eds. (2005): Status: U.S. ESA - Candidate taxon; IUCN - Lower Risk (nt)
Wilson & Reeder, eds. (2005): Comments: Subgenus Cynomys. Intraspecific variation reviewed by Chesser (1983). Reviewed by Hoogland (1996, Mammalian Species No. 535)
David F. Mitchell, ITIS Data Development Specialist: US ESA: Petition to list as threatened or endangered not warranted according to 12-month petition finding, as published in Federal Register Volume 74, Number 231, Pages 63343 - 63366, December 03, 2009