For Hasteola
Anderson, L.C. 1994. A revision of Hasteola (Asteraceae) in the New World. Syst. Bot. 19: 211-219.
Anderson, L.C. 2006b. Hasteola. In Flora of North America Editorial Committee. 2006b. Flora of North America north of Mexico. Volume 20, Magnoliophyta: Asteridae, part 6: Asteraceae, part 2. Oxford Univ. Press, New York, NY. 666 pp.
Anderson, L.C., E.L. Bridges, and S.L. Orzell. 1995. New data on distribution and morphology for the rare Hasteola robertiorum (Asteraceae). Phytologia 78: 246-248.
Pelser, P.B., B. Nordenstam, J.W. Kadereit, and L.E. Watson. 2007. An ITS phylogeny of tribe Senecionae (Asteraceae) and a new delimitation of Senecio L. Taxon 56: 1077-1104.
Pruski, J.F. Studies of Neotropical Compositae–XV. The new genus Chaetacalia, retention of Aetheolaena, Culcitium, Haplosticha, and Iocenes, two new species of Senecio, and Lasiocephalus revisited again (Senecioneae: Senecioninae). Phytoneuron 2021-65: 1-83. Published 22 December 2021. ISSN 2153 733X