Adi, D.P. and Masruri, M.S. 2018. Keefektifan pendekatan saintifik model problem based learning, problem solving, dan inquiry dalam pembelajaran IPS. Harmoni Sosial: Jurnal Pendidikan IPS. 4, 2 (Nov. 2018), 142–152. DOI:https://doi.org/10.21831/hsjpi.v4i2.9826.