Istiqomah, Nurul, and Wati Sukmawati. “Stacking Analysis of the Mastery of Science Concepts in the RADEC Learning Model for Grade IV Elementary Students”. Jurnal Penelitian Pendidikan IPA, vol. 9, no. 10, Oct. 2023, pp. 7993-00, doi:10.29303/jppipa.v9i10.3999.