Escobaria guadalupensis
Marc. A. Baker.; Robert A. Johnson. 2000. Morphometric analysis of Escobaria sneedii var. sneedii, E. sneedii var. leei, and E. guadalupensis (Cactaceae). Systematic Botany 25(4): pp. 577-587.
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.
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.
Unknown, (1992). Locations of Corypanthia sneedii var. sneedii on the Guadalupe Ranger District. Relabled as Escobaria Guadalupensis. Guadalupe RD, Lincoln NF, USFS. 8 p.
Worthington, R. 2002. Inventory of the Flora of the Guadalupe Mountains, New Mexico and Texas. Second Working Draft. USFS
Knight, P. (1982) Unpublished report on Coryphantha sneedii var. sneedii, Guadalupe RD, Lincoln NF, USFS. 1 p.
Turner, R. (1990). Area survey results for Corphantha[sic] sneedii var sneedii. Guadalupe RD, Lincoln NF, USFS. 1 p.