“PENGARUH MODEL PROBLEM BASED LEARNING (PBL) TERHADAP RETENSI DAN KEMAMPUAN BERPIKIR KRITIS IPA PESERTA DIDIK SD”. JURNAL ILMIAH PENDAS: PRIMARY EDUCATION JOURNAL, vol. 1, no. 1, Juni 2020, hlm. 1-11, https://doi.org/10.29303/pendas.v1i1.49.