Kristiawan, R., P. M. Purbosari, and Sularmi. “Peningkatan Berpikir Kritis Dan Hasil Belajar IPA Melalui Model Problem Based Learning”. Educatif Journal of Education Research, Vol. 4, no. 3, July 2021, pp. 57-64, doi:10.36654/educatif.v4i3.115.