Gosling, Marlusa, and Gilberto Cifuentes Dias Araújo. “The Physical Health of Rural Workers Exposed to Noise and to Thermal Load: A Study of Tractor Operators”. O Mundo Da Saúde, vol. 32, no. 3, July 2008, pp. 275-86, doi:10.15343/0104-7809.200832.3.2.