- ↑ database, The PLANTS Database, 2000
- ↑ U. S. Fish and Wildlife Service, 2009Endangered and Threatened Wildlife and Plants; Taxonomic Change of Sclerocactus glaucus to Three Separate Species Federal Register, vol. 74, no. 177
- ↑ 3.0 3.1 Roskov 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". Species 2000: Reading, UK. Ginkuhà 26 Mayo 2014. CS1 maint: multiple names: authors list (link) CS1 maint: extra text: authors list (link)
- ↑ (Canada);http://siit.conabio.gob.mx (Mexico) ITIS Global: The Integrated Taxonomic Information System
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