Escobaria sneedii var. sneedii
Worthington, R. D. 1981. Locations of two populations of Sneed's cactus in the Anthony Gap area. University of Texas. Department of Biological Sciences. El Paso, Texas 79968. 6 pages.
Tonne, P. 2001. Status Report for Sneed's Pincushion Cactus (Escobaria sneedii var. sneedii; Cactaceae). Report for U.S. Fish and Wildlfie Service. Albuquerque, NM. 16 p.
Worthington, R. 2000. Inventory of the Flora of the New Mexico Portion of the Guadalupe Mountains, Otero and Eddy Counties, New Mexico, Working Second Draft. USFS.
Gulf South Research Corporation. 2012. Sneed's Pincushion Cactus (Escrobaria sneedii var. sneedii) genetics study. Annual report to U.S. Fish and Wildlife Service, Section 10 TE-64595A. 46p.
Unknown, 1980. Guadalupe Mountains, Black canyon, list of plants noted.
Davis, J. 1994. Letter to Laird McIntosh (BLM Las Cruces District office) concerning monitoring of Bishops Cap, Coryphantha sneedii var sneedii plots. Includes also notes by Laird McIntosh about status of Webb Gap plots.
Van Devender, R., and R. Rondeau. 1992. The status of Sneed's pincushion cactus (Coryphantha sneedii var. sneedii) in Texas. Southwestern Field Biologists. Tuscon, Arizona. 20 p.
Worthington, R. 2002. Inventory of the Flora of the Guadalupe Mountains, New Mexico and Texas. Second Working Draft. USFS
McIntosh, L. 1987. Location of monitoring plots, Coryphantha sneedii, Anthony Gap population, Bishops Cap population, Webb Gap population. Copies made from USGS 7.5 quad maps. BLM, Las Cruces District office.
Birnbaum, S. J. 2001. Sneed's pincushion cactus (Escobaria sneedii var. sneedii) localities in New Mexico. Texas Parks and Wildlife. Austin, Texas. 2 pages.