Karmila A, Arief NAR, Friska S, Astuti L. A Development of E-Learning Chemistry Based on Project Based Learning on Buffer Solution Using Then Flipped Classroom Approach in Class XI SMA/MA. JHICE [Internet]. 2022 Jan. 30 [cited 2026 Jul. 12];2(01):19-27. Available from: http://jhice.ppj.unp.ac.id/index.php/jhice/article/view/35