Frederick Traugott Pursh:Flora americae septentrionalis; or A Systematic Arrangement and Description of The Plants of North America. Oxford University Press, London 1813, Heterotheca villosa (Digitalisat).
John C. Semple:Range expansion of Heterotheca camporum (Compositae: Astereae) in the southeastern United States. In: New York Botanical Garden, Bronx, NY (Hrsg.): Brittonia. Band35, Nr.2, 1983, S.140–146, doi:10.2307/2805950.
John C. Semple:Asteraceae Heterotheca. In: Flora of North America Editorial Committee (Hrsg.): Flora of North America North of Mexico. Band20: Magnoliophyta: Asteridae, part 7: Asteraceae. Oxford University Press, New York u.a. 2006, ISBN 0-19-530564-7, Heterotheca villosa (textgleiche Online-Version).
Lloyd Herbert Shinners:The North Texas Species of Heterotheca, Including Chrysopsis (Compositae). In: Science Devision of the Southern Methodist University (Hrsg.): Field and Laboratory. Band19, Nr.2, 1951, S.71 (Online).