Guillén Correas, Roberto, and Carlos Peñarrubia Lozano. “Incorporación De Contenidos De Actividades En El Medio Natural Mediante La investigación-acción Colaborativa (Integration of Activities in the Natural Environment As Contents of Education Trhough Collaborative Action-Research)”. Retos 23 (January 1, 2013): 23–28. Accessed November 1, 2025. http://www.revistaretos.org/index.php/retos/article/view/34562.