For Catharanthus
Endress, M.E., U. Meve, D.J. Middleton, and S. Liede-Schumann. 2018. Apocynaceae. In Kadereit, J., & V. Bittrich. 2018. The families and genera of flowering plants. XV. Flowering plants. Eudicots. Apiales, Gentianales (except Rubiaceae). Springer, Cham.
Lemke, D.E. 2023d. Catharanthus. In Flora of North America Editorial Committee. 2023c. Flora of North America north of Mexico. Volume 14, Magnoliophyta: Gentianaceae to Hydroleaceae. Oxford Univ. Press, New York, NY. 505 pp.
Snoeijer, W. 1996. Catharanthus roseus, the Madagascar Periwinkle, a review of its cultivars. Wageningen Agricultural University Papers 96-3: 47-120.
van Bergen, M.A. 1996. Revision of Catharanthus G. Don; series of revisions of Apocynaceae XLI. Wageningen Agricultural University Papers 96-3: 1-46.
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