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→Referències
* Heiser, Jr., Charles B., 1951. «The Sunflower among the North American Indians.» Proceedings of the American Philosophical Society, Vol. 95, No. 4 pp. 432-448
* Heiser, Jr., Charles B., 1951. «The Sunflower among the North American Indians.» Proceedings of the American Philosophical Society, Vol. 95, No. 4 pp. 432-448
* Heiser, Jr., Charles B. 1955. «Origin and development of the cultivated sunflower.» Am. Biol. Teacher Vol. 17, No. 4 pp. 161-167
* Heiser, Jr., Charles B. 1955. «Origin and development of the cultivated sunflower.» Am. Biol. Teacher Vol. 17, No. 4 pp. 161-167
* [http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200024005 Helianthus annuus en Flora of North America]
* [http://www.theplantlist.org/tpl/record/gcc-44475 Helianthus annuus en The Plant List]
* [http://legacy.tropicos.org/Name/2700851 Tropicos.org. Missouri Botanical Garden. - Helianthus annuus]
== Bibliografia ==
== Bibliografia ==