Franco Ortiz, Elías. “Ecological Committee of Risaralda Caldas ‘CER’”. Revista Luna Azul (On Line), no. 11-12 (January 1, 2001): 1 de 2. Accessed July 3, 2024. https://revistasojs.ucaldas.edu.co/index.php/lunazul/article/view/1457.