Normas Editoriales. REVISTA DE INVESTIGACIÓN SIGMA, [S. l.], v. 7, n. 01, 2020. DOI: 10.24133/sigma.v7i01.1847. Disponível em: https://journal.espe.edu.ec/ojs/index.php/Sigma/article/view/1847. Acesso em: 1 jul. 2025.