Murwantono, Murwantono, and Sukidjo Sukidjo. “PENINGKATAN HASIL BELAJAR IPS DENGAN MODEL PROBLEM BASED LEARNING BERBANTUAN MEDIA STIMULAN GAMBAR”. Harmoni Sosial: Jurnal Pendidikan IPS, vol. 2, no. 1, Mar. 2015, pp. 30-41, doi:10.21831/hsjpi.v2i1.4601.