Ayunisa, Puan Mutia, et al. “Potential Study and Cost Analysis in Making Waru Leaf Extract Hand Sanitizer (Hibiscus Tiliaceus)”. Agroindustrial Technology Journal, vol. 7, no. 1, May 2023, pp. 100-9, https://atj.journal.unida.gontor.ac.id/index.php/atj/article/view/165.