SCHUMACHER, Leon G.; JOHNSON, Donald M.; HIRES, William G.; FRISBY, James C.; HARRISON, John D. Tractor Safety: Are Farmers Using OEM Devices. Journal of Agricultural Systems, Technology, and Management, [S. l.], v. 6, n. 1, p. 18–23, 1990. Disponível em: https://jastm.org/index.php/jastm/article/view/11945. Acesso em: 23 feb. 2025.