Pandey, Arun K., and Anupama Jha. “Achene Anatomy in Coreopsidinae (Heliantheae; Compositae) and Its Systematic Implications”. Rheedea, vol. 2, no. 1, June 1992, pp. 19-26, https://doi.org/10.22244/rheedea.1992.02.01.03.