P. K. Mallick, “Karyomorphology, Meiotic Behaviours and Pollen Fertility of Calendula officinalis L. (Calenduleae- Asteraceae)”, Int J Appl Sci Biotechnol, vol. 9, no. 1, pp. 75–79, Mar. 2021, doi: 10.3126/ijasbt.v9i1.36011.