Umar, N., E. Ristiana, and R. Babo. “The Effect of Problem-Based Learning on Concept Mastery and Scientific Attitudes of Fifth Grade Students”. Edumaspul: Jurnal Pendidikan, Vol. 7, no. 2, Oct. 2023, pp. 2762-65, doi:10.33487/edumaspul.v7i2.5908.