O'CONNELL, Mark. Against the Odds: Major Donald E. Keyhoe and His Battle to End UFO Secrecy. Journal of Scientific Exploration, [S. l.], v. 39, n. 1, p. 144–145, 2025. DOI: 10.31275/20253673. Disponível em: https://journalofscientificexploration.org/index.php/jse/article/view/3673. Acesso em: 2 may. 2026.