ANWAR, Syahferi. The Relationship between Volunteer Preparedness and the Action of Spraying Disinfectants in Preventing Covid 19 at PMI North Sumatra Province in 2021 . Science Midwifery, [S. l.], v. 10, n. 1, October, p. 561–567, 2022. Disponível em: https://midwifery.iocspublisher.org/index.php/midwifery/article/view/319. Acesso em: 1 may. 2026.