Viyanti, V., Rizki Eka Shintya, Undang Rosidin, Agus Suyatna, & Noor Farawahidah. (2025). Analysis of Project-Based Problem-Solving Skills of Optical Equipment Materials with Heller and Heller Steps. Jurnal Pendidikan IPA Indonesia, 14(2). https://doi.org/10.15294/jpii.v14i2.23810