LUPERA NAVARRETE, Joffre Olmedo. “Iso standardization of colors or in the process of recycling in schools”. Revista Universidad de Guayaquil, [S. l.], v. 113, n. 2, p. 45–52, 2012. DOI: 10.53591/rug.v113i2.1189. Disponível em: https://revistas.ug.edu.ec/index.php/rug/article/view/480. Acesso em: 21 apr. 2026.