For Trifolium
Chapel, K.J. and M.A. Vincent. 2013. Trifolium kentuckiense (Fabaceae, Papilionoideae), a new species from Franklin and Woodford counties, Kentucky. Phytoneuron 2013-63: 1-6. Published 13 September 2013. ISSN 2153 733X
Collins, J.L., and T.F. Wieboldt. 1992. Trifolium calcaricum (Fabaceae), a new clover from limestone barrens of eastern United States. Castanea 57: 282-286.
Isely, D. 1998. Native and naturalized Leguminosae (Fabaceae) of the United States (exclusive of Alaska and Hawaii). Monte L. Bean Life Science Museum, Brigham Young Univ., Provo, UT.
Vincent, M.A., and J.M. Gillett. 2023. Trifolium. Pp. 914-974. In Flora of North America Editorial Committee. 2023b. Flora of North America north of Mexico. Volume 11.2, Magnoliophyta: Fabaceae, part 2. Oxford Univ. Press, New York, NY. 543-1108 pp.
Zohary, D., and D. Heller. 1984. The genus Trifolium. Israel Academy of Sciences and Humanities, Jerusalem. 606 pp.
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