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For Heliopsis

Cronquist, A. 1980. Asteraceae, Volume I, Vascular flora of the Southeastern United States. University of North Carolina Press, Chapel Hill, N.C.

Fisher, T.R. 1957. Taxonomy of the genus Heliopsis (Compositae). Ohio J. of Sci. 57: 171-191.

Smith, A.R. 2006a. Heliopsis. In Flora of North America Editorial Committee. 2006c. Flora of North America north of Mexico. Volume 21, Magnoliophyta: Asteridae, part 6: Asteraceae, part 3. Oxford Univ. Press, New York, NY. 616 pp.

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