“PENGEMBANGAN BAHAN AJAR INOVATIF RUMUS KIMIA DAN PERSAMAAN REAKSI BERBASIS MODEL PEMBELAJARAN PROBLEM BASE LEARNING (PBL)”, J.Pendidik.Kim, vol. 7, no. 1, pp. 17–23, Apr. 2015, doi: 10.24114/jpkim.v7i1.5493.