GORDON, R. Notes on Society History: An Essential Element. Journal of System Safety, [S. l.], v. 52, n. 3, p. 7, 2017. DOI: 10.56094/jss.v52i3.117. Disponível em: https://jsystemsafety.com/index.php/jss/article/view/117. Acesso em: 21 apr. 2026.