The effects of hand soap making practice with addition of pineapple skin extract (Ananas comosus L. Merr) on learning interests in colloidal materials in senior high school. J.Pendidik.Kim [Internet]. 2019 Dec. 10 [cited 2026 Apr. 23];11(3):129-35. Available from: https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/15798