Poblete Valderrama, F., F. Bravo Coronado, C. Villegas Aichele, and E. Cruzat Bravo. “Physical Activity Level and Functionality in the Elderly”. Revista Ciencias De La Actividad Física UCM, Vol. 17, no. 1, June 2016, pp. 59-65, http://200.9.234.116/index.php/revistacaf/article/view/91.