HELLIER, E.; EDWORTHY, J. Quantifying the perceived urgency of auditory warnings. Canadian Acoustics, [S. l.], v. 17, n. 4, p. 3–11, 1989. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/611. Acesso em: 21 feb. 2025.