Cabero Almenara, J., J. Barroso Osuna, and R. Romero Tena. “Learning Based on a Personal Learning Environment (PLE)”. Bordon. Revista De Pedagogia, vol. 67, no. 2, Mar. 2015, pp. 63-83, https://recyt.fecyt.es/index.php/BORDON/article/view/Bordon.2015.67205.