↑U. S. Fish and Wildlife Service, (1993) Endangered and Threatened Wildlife and Plants; Final Rule To Delist the Plant Hedeoma apiculatum (McKittrick Pennyroyal) and Remove Its Critical Habitat Designation Federal Register, vol. 58, no. 182
↑ 6.06.1Roskov 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)