HARTWELL, Christopher A. The Measurement and Impact of Uncertainty. Zarządzanie i Finanse, [S. l.], v. 16, n. 2, p. 23–32, 2018. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/zif/article/view/8968. Acesso em: 11 kwi. 2025.