Putri, Pungky Dilaka, et al. “THE EFFECTIVENESS OF PROBLEM-BASED LEARNING (PBL) MODELS BASED ON SOCIO-SCIENTIFIC ISSUES (SSI) TO IMPROVE THE ABILITY OF SCIENCE LITERACY ON CLIMATE CHANGE MATERIALS”. JPPS (Jurnal Penelitian Pendidikan Sains), vol. 7, no. 2, June 2018, pp. 1519-24, doi:10.26740/jpps.v7n2.p1519-1524.