Fitz Maurice, B, Fitz Maurice, W.A., Hernández, H.M., Sotomayor, M. & Smith, M.: 'Mammilloydia candida'IUCN Red List of Threatened Species. Version 2022-1. 2017. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 18.8.2022. (englanniksi)
