Wijayanto, Pikir Wisnu, et al. “Implementation of Problem Based Learning Model to Improve Early Childhood Abilities in Creative Thinking”. Jurnal Obsesi : Jurnal Pendidikan Anak Usia Dini, vol. 7, no. 1, Feb. 2023, pp. 1017-23, doi:10.31004/obsesi.v7i1.3909.