2002
Muldavin, E, S. Wondzell, and J. A. Ludwig. 2002. Forty years of vegetation change in desert grasslands of Big Bend National Park. . 21 +app
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Muldavin, E, S. Wondzell, and J. A. Ludwig. 2002. Forty years of vegetation change in desert grasslands of Big Bend National Park. . 21 +app
Natural Heritage New Mexico. 2008. Fort Davis National Historic Site Photo Map. Natural Heritage New Mexico Publ. No. 08-GTRmap-330. Natural Heritage New Mexico, University of New Mexico, Albuquerque, NM.
Weniger, D. 1984. Cacti of Texas and neighboring states: a field guide. Univ. of Texas Press, Austin. 356 pp.
U.S. Fish and Wildlife Service. 2000. Federally listed as threatened and endangered species of Texas. March 28, 2000. . 59 p.
Higgins, L.C. 1989. Guadalupe Mountains National Park threatened and endangered and exotic plant surveys. Report prepared for Guadalupe Mountains National Park.
Arizona Game and Fish Department. 2003. Draba standleyi. Unpublished abstract compiled and edited by the Heritage Data Management System, Arizona Game and Fish Department, Phoenix, AZ. 4 p.
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Powell, A. M. 1983. Perityle (Asteraceae), New Species and Notes. Madrono, 30, No. 4: 217-225.
Correll, D.S., and M.C. Johnston. 1970. Manual of the vascular plants of Texas. Texas Research Foundation, Renner. 1881 pp.