For Ricinus
Gillespie, L.J. 2016a. Mercurialis. In Flora of North America Editorial Committee. 2016. Flora of North America north of Mexico. Volume 12, Magnoliophyta: Vitaceae to Garryaceae. Oxford Univ. Press, New York, NY. 603 pp. Google Scholar
Govaerts, R., D.G. Frodin, and A. Radcliffe-Smith. 2000. World checklist and bibliography of Euphorbiaceae (with Pandaceae). Volumes 1-4. Royal Botanic Gardens, Kew, England. Google Scholar
Webster, G.L. 2014. Euphorbiaceae. In Kubitzki, K., ed. 2014. The families and genera of vascular plants, XI. Flowering plants – Eudicots – Malpighiales. Springer, Berlin. 331 pp. Google Scholar