Suyanta, S. 2020. USING THE PROBLEM BASE LEARNING (PBL) LEARNING MODEL TO IMPROVE CRITICAL THINKING ABILITY IN CHEMICAL LEARNING ABOUT TERMOCYMIA FOR STUDENTS IN CLASS XI MIPA 3 SMAN 1 BAMBANGLIPURO BANTUL. Ideguru: Jurnal Karya Ilmiah Guru. 5, 1 (May 2020), 109-114. DOI:https://doi.org/10.51169/ideguru.v5i1.119.