Aragón Mendizábal, Estíbaliz L., et al. “Playing With Numbers 2: Complementary Software to Early Math Instruction”. TECHNO REVIEW. International Technology, Science and Society Review Revista Internacional De Tecnología, Ciencia Y Sociedad, vol. 2, no. 2, June 2013, pp. 1-12, doi:10.37467/gka-revtechno.v2.1282.