Usman, M. H., Al Idrus, A., Doyan, A., Soeprianto, H., & Hakim, A. (2021). Teacher Basic Skills in Learning Science in Junior High Schools Facing the 21st Century. Jurnal Penelitian Pendidikan IPA, 7(3), 331–334. https://doi.org/10.29303/jppipa.v7i3.652