Suwarno, Enggar Eko, et al. “KEEFEKTIFAN PROBLEM BASED LEARNING BERBANTU MEDIA AUDIO VISUAL TERHADAP HASIL BELAJAR IPS KELAS IV SD”. JS (JURNAL SEKOLAH), vol. 6, no. 1, Dec. 2021, pp. 97-102, doi:10.24114/js.v6i1.30024.