G., Jyotisree, Sruthi R., C. R. Biju, and Amita S. Menon. “Calendula Officinalis and Echinacae Purpurae As Antimicrobial Agent”. Journal of Applied Pharmaceutical Research 8, no. 2 (June 29, 2020): 08-12. Accessed February 22, 2025. https://japtronline.com/index.php/joapr/article/view/129.