Normas Editoriales. REVISTA DE INVESTIGACIÓN SIGMA, [S. l.], v. 5, n. 02, 2018. DOI: 10.24133/sigma.v5i02.1258. Disponível em: https://journal.espe.edu.ec/ojs/index.php/Sigma/article/view/1258.. Acesso em: 19 may. 2024.