1. S. Arias, T. Terrazas, K. Cameron, "Systematic Botany." 28, "Phylogenetic analysis of Pachycereus (Cactaceae, Pachycereeae) based on chloroplast and nuclear DNA sequences." 547 (2003)
2. S. Arias and T. Terrazas "Revista Mexicana de Biodiversidad." 79, "Pachebergia (Cactaceae), a nothogenus from western Mexico." 23 (2008)
3. M.A. Baker, "Journal of the Botanical Research Institute of Texas." 10, "Morphological and cytological analyses in Cylindropuntia (Cactaceae): the taxonomic circumscription of C. echinocarpa, C. multigeniculata, and C. whipplei." 325 (2016)
4. M.A. Baker, D.J. Pinkava, M.A. Cloud-Hughes, "Canotia." 14, "Analysis of infraspecific taxa within Cylindropuntia acanthocarpa using multivariate analysis of morphological characters." 66 (2018)
5. M.A. Baker and M.A. Cloud-Hughes "Madroño." 61, "Cylindropuntia chuckwallensis (Cactaceae), a new species from Riverside and Imperial Counties, California." 231 (2014)