Normas Editoriales. REVISTA DE INVESTIGACIÓN SIGMA, [S. l.], v. 6, n. 01, 2019. DOI: 10.24133/sigma.v6i01.1321. Disponível em: https://journal.espe.edu.ec/ojs/index.php/Sigma/article/view/1321.. Acesso em: 24 nov. 2024.