Turland, N. J., Wiersema, J. H., Barrie, F. R., Greuter, W., Hawksworth, D. L., Herendeen, P. S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T. W., McNeill, J., Monro, A. M., Prado, J., Price, M. J. & Smith, G. F. (eds.). «2018: International Code of Nomenclature for algae, fungi, and plants». (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159. Glashütten: Koeltz Botanical Books. «An organism may thus be assigned to taxa at the following ranks (in descending sequence): … species (species), subspecies (subspecies), variety (varietas), subvariety (subvarietas), form (forma), and subform (subforma).»CS1-vedlikehold: Flere navn: forfatterliste (link)CS1-vedlikehold: Ekstra tekst: forfatterliste (link)
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«Varietet». Institutt for biovitenskap, UIO. Besøkt 5. mai 2021.