Abellán, F. J., M. T. Calvo-Llena, and R. Rabadán. “Harmonic Development Scale. An Integrative Proposal for the Evaluation of Children´s Development.”. Anales De Psicología / Annals of Psychology, Vol. 31, no. 3, Sept. 2015, pp. 837-48, doi:10.6018/analesps.31.3.199901.