HUMBERSTONE MORALES, James Edward. Firma Electrónica en El Salvador. Realidad y Reflexión, [S. l.], v. 43, p. 64–72, 2017. DOI: 10.5377/ryr.v43i0.3549. Disponível em: https://www.camjol.info/index.php/RyR/article/view/3549. Acesso em: 6 dic. 2025.