Sinaga, Citra Permata Sari, and Susilawati Amdayani. “Implementation of STEM-PjBL Teaching Materials to Improve Student Learning Outcomes and Interest in Acid-Base Topics”. Hydrogen: Jurnal Kependidikan Kimia, vol. 14, no. 3, June 2026, doi:10.33394/hjkk.v14i3.20649.