SEPÚLVEDA GALLEGO, L. E. Manizales formal environmental education at the beginning of the millennium I. Revista Luna Azul (On Line), [S. l.], n. 20, p. 1 de 10, 2005. Disponível em: https://revistasojs.ucaldas.edu.co/index.php/lunazul/article/view/1050. Acesso em: 18 may. 2024.