PÉREZ-GONZÁLEZ, J. C.; TRUJILLO-VÁZQUEZ, J. M. The importance of certification. CienciaUAT, [S. l.], v. 3, n. 1, p. 26-27, 2008. Disponível em: https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/417. Acesso em: 17 may. 2024.