Firnanda, F., and L. Rosdiana. “READABILITY AND COMPATIBILITY OF CLASS VIII SUBSTANCE PRESSURE MATERIALS WITH SCIENCE PROCESS SKILLS CATEGORIES”. JPPIPA (Jurnal Penelitian Pendidikan IPA), vol. 6, no. 2, Dec. 2021, pp. 108-14, doi:10.26740/jppipa.v6n2.p108-114.