Ningsih, S., I. . Sutisna, S. . Tangahu, N. A. . MM, and S. Sodik. “The Effects of the Marble Shapes Digital Game on preschoolers’ Geometric Recognition”. Journal of Early Childhood Care and Education, vol. 9, no. 1, Mar. 2026, pp. 17-27, doi:10.26555/jecce.v8i2.14509.