Gerbino, M., M. G. Caprara, and G. V. Caprara. “Stability and Prediction of Physical agresión from Childhood to Adolescence: A Multi-Informant Study”. Acción Psicológica, vol. 4, no. 2, July 2012, pp. 169-82, doi:10.5944/ap.4.2.485.