Kyle, Tilly Louise, Antonio Hernández Mendo, Rafael Enrique Reigal Garrido, and Verónica Morales Sánchez. 2016. “Efectos De La Actividad física En El Autoconcepto Y La Autoeficacia En Preadolescentes (Effects of Physical Activity on Self-Concept and Self-Efficacy in Preadolescents)”. Retos 29 (January): 61-65. https://doi.org/10.47197/retos.v0i29.36873.