MELLON, J. Shulsky, Abram N., and Gary J. Schmitt. Silent Warfare: Understanding the World of Intelligence, 3rd ed. Journal of Conflict Studies, [S. l.], v. 23, n. 2, 2006. Disponível em: https://journals.lib.unb.ca/index.php/JCS/article/view/228. Acesso em: 7 dec. 2021.