de MIGUEL GONZALEZ , R. “GEOMEDIA FOR EDUCATION IN SUSTAINABLE DEVELOPMENT IN SPAIN. AN EXPERIENCE IN THE FRAMEWORK OF THE AIMS OF DIGITAL-EARTH.EU”. European Journal of Geography, vol. 3, no. 3, Nov. 2012, pp. 44-56, https://www.eurogeojournal.eu/index.php/egj/article/view/541.