DE LEON, P. Sustaining Total Quality Management and ISO 9001 in Valenzuela, Philippines . Journal of Management Studies and Development, [S. l.], v. 5, n. 02, p. 362–381, 2026. DOI: 10.56741/IISTR.jmsd.002121. Disponível em: https://journal.iistr.org/index.php/JMSD/article/view/2121. Acesso em: 7 oct. 2026.