↑Flora of North America Editorial Committee, eds., 2003 Flora of North America North of Mexico, vol. 4: Magnoliophyta: Caryophyllidae, part. 1, The volumes are also reproduced online (http://www.fna.org/)
↑U. S. Fish and Wildlife Service, (2009) Endangered and Threatened Wildlife and Plants; Taxonomic Change of Sclerocactus glaucus to Three Separate Species Federal Register, vol. 74, no. 177
12Roskov Y., Kunze T., Orrell T., Abucay L., Paglinawan L., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Decock W., De Wever A., Didžiulis V. (ed) (2014). "Species 2000 & ITIS Catalogue of Life: 2014 Annual Checklist". Catalogue of Life. Species 2000: Reading, UK. Ginkuhà 26 Mayo 2014.CS1 maint: multiple names: authors list (link) CS1 maint: extra text: authors list (link)
