VILLALTA, Augusto. Quality Management Manual at the Technological University of El Salvador. ISO 9001: 2000. Entorno, [S. l.], n. 38, p. 27–33, 2007. DOI: 10.5377/entorno.v0i38.7349. Disponível em: https://www.camjol.info/index.php/entorno/article/view/7349. Acesso em: 5 dec. 2025.