For Grindelia
Bartoli, A., and R.D. Tortosa. 2012. Revision of the North American species of Grindelia (Asteraceae) 1. Ann. Mo. Bot. Gard., 98(4): 447-513.
Cronquist, A. 1980. Asteraceae, Volume I, Vascular flora of the Southeastern United States. University of North Carolina Press, Chapel Hill, N.C.
Nesom, G.L. 2019d. Taxonomy of Grindelia lanceolata sensu lato (Asteraceae). Phytoneuron 2019-34: 1-22. Published 26 September 2019 ISSN 2153 733X
Strother, J.L., and M.A. Wetter. 2006a. Grindelia. 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.
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