Hidayatulloh, R. et al. 2020. Development of STEM-Based Chemistry Textbooks to Improve Students’ Problem Solving Skills. Jurnal Penelitian dan Pengkajian Ilmu Pendidikan: e-Saintika. 4, 3 (Nov. 2020), 308–318. DOI:https://doi.org/10.36312/e-saintika.v4i3.306.