Wahyuningsih. “Improving Cognitive Ability of Geometric Shapes by Using Natural Media at RA Perwanida Blitar”. ETNOPEDAGOGI: Jurnal Pendidikan Dan Kebudayaan, vol. 1, no. 2, Apr. 2024, pp. 130-41, doi:10.62945/etnopedagogi.v1i2.509.