Siswanto, D.H. and Andriyani 2024. Analysis of the Need for Flip Worksheets Matrix PBL Models to Stimulate Critical Thinking Abilities. Pelita : Jurnal Penelitian dan Karya Ilmiah. 24, 1 (Aug. 2024), 91–99. DOI:https://doi.org/10.33592/pelita.v24i1.4781.