García Quiroga, Fernando, and María Sotelo Pérez. 2012. “Transformations on tourism trends and their impact on the environment: a case study in the province of Ávila”. M+A. Revista Electrónica de Medioambiente, no. 11 (July): 1-17. https://revistas.ucm.es/index.php/MARE/article/view/38072