R. Hidayatulloh, S. Suyono, and U. Azizah, “Development of STEM-Based Chemistry Textbooks to Improve Students’ Problem Solving Skills”, J. Penelit. dan. Pengkaj. Ilmu. Pendidik. e-Saintika, vol. 4, no. 3, pp. 308–318, Nov. 2020, doi: 10.36312/e-saintika.v4i3.306.