Wulandari, S. I., and A. Suwandewi. “Utilization Of The Betel Plant (Piper Betle) As A Natural Antiseptic To Make Hand Sanitizers”. Prosiding Pengembangan Masyarakat Mandiri Berkemajuan Muhammadiyah (Bamara-Mu), vol. 1, no. 1, Sept. 2021, pp. 669-73, https://proceeding.mbunivpress.or.id/index.php/bamara/article/view/291.