Kundu, Sampat Kumar, Kuntal Pal, and Manas Kumar Mandal. “Thin Layer Chromatographic Study of Three Different Extract of Calendula Officinalis Leaves”. PharmaTutor 3, no. 10 (October 1, 2015): 30-32. Accessed June 23, 2026. http://www.pharmatutorjournal.com/index.php/pt/article/view/313.