Ulfia Violina Shellby Agustin and Firosalia Kristin (2023) “Efektifitas Model Pembelajaran Problem Based Learning dan Discovery Learning Terhadap kemampuan Berpikir Kritis Siswa kelas 6 Muatan Pelajaran IPS”, Journal of Education Research, 4(4), pp. 1716–1722. doi: 10.37985/jer.v4i4.489.