Echinocereus fendleri var. kuenzleri
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DeBruin, E. 1993. Echinocereus fendleri var. kuenzleri, status summary of known populations. Unpubl. report by New Mexico Natural Heritage Program prepared for U.S. Fish and Wildlife Service, Albuquerque, NM. 23 p.
Debruin, E. 1992. Echinocereus fendleri var. kuenzleri inventory, Elk, New Mexico Vicinity. Unpubl. report by New Mexico Natural Heritage Program for BLM Roswell Resource Area.
Unknown. 1989. Monitoring Endangered Plants: Echinocereus fendleri var. kuenzleri. United States Forest Service (USFS) Regional Office, Albuquerque, NM. p.17.
Russel, R., J. Anderson, J. Peterson. 1989. Kuenzleri Hedgehog Cactus Survey Final Report. United States Forest Service (USFS) Regional Office, Albuquerque, NM. p. 23.
Russell, Randy. 1987. Letter and memo regarding Hedgehog Cactus. Unites States Forest Service (USFS) Regional Office, Albuquerque, NM. p. 7.
Cavello, J. Theye, N. Kuhar, K. Terry, K. (2014) Multiple Bundled Inventory Completion Reports, Sensitive Plant Survey, Lincoln National Forest, Field Notes. Project Name: FY2014 Sargent Allotment Kuenzler Survey. Guadalupe Ranger District, Lincoln Nation
Fragua, S. Finley, M. Stewart, P. Sando, M. Stary, W. (2013) Inventory Completion Report, Sensitive Plant Survey, Lincoln National Forest, Field Notes. Project Name: Echinocereus var. fendleri keunzleri. Guadalupe Ranger District, Lincoln National Forest,
Fragua, S. (2013) Inventory Completion Report, Sensitive Plant Survey, Lincoln National Forest, Field Notes. Project Name: Echinocereus var. fendleri keunzleri.Guadalupe Ranger District, Lincoln National Forest, USFS. 4 p.