Ochotona princeps nigrescens
Hafner, D.J. 1994. An unpublished manuscript of specimens examined for Ochotona princeps nigrescens in the Jemez Mountains. . 2 p.
McConachie, J. 1993. Letter to David Mehlman, 25 January 1993. List of specimens of selected mammals from New Mexico Museum of Natural History collection.
Gaines, Karen H. and S. Boczkiewicz. 1995. Specimen tag information from the New Mexico State University vertebrate museum, Las Cruces. 14 December 1995.
Hafner, D.J. 1993. Unpublished manuscript on Ochotona princeps nigrescens in New Mexico. . 2 p.
United States Forest Service. 2002. Environmental Assessment for the Jemez National Recreation Area Forest Plan Amendment and Management Plan. United States Department of Agriculture.. 85 p.
Hafner, D. J., and R. M. Sullivan. 1995. Historical and ecological biogeography of Nearctic pikas (Lagomorpha: Ochotonidae). Journal of Mammalogy 76:302-321.
David J. Hafner and Andrew T. Smith (2010) Revision of the subspecies of the American pika, Ochotona princeps (Lagomorpha: Ochotonidae). Journal of Mammalogy: April 2010, Vol. 91, No. 2, pp. 401-417.
Hafner, David J. 1993. North American pika (Ochotona princeps) as a Late Quaternary biogeographic indicator species. Quaternary Research. 39:373-380.