For Iva
Cronquist, A. 1980. Asteraceae, Volume I, Vascular flora of the Southeastern United States. University of North Carolina Press, Chapel Hill, N.C.
Jackson, R.C. 1960. A revision of the genus Iva. Univ. Kansas Sci. Bull. 41: 793-876.
Strother, J.L. 2006gg. Iva. 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.
Turner, B.L. 2009a. Taxonomy of Iva angustifolia and I. asperifolia (Asteraceae). Phytologia 91: 76-83.
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