Pimda, Pornthip, Naesinee Chaiear, Kwanchanok Yimtae, Jiraporn Khiewyoo, Panida Thanawiratananit, and Napaporn Krusun. 2016. “Incidence of Industrial Employees Having Standard Threshold Shifts; A Study of the Existing Audiograms”. Srinagarind Medical Journal 31 (3):287-92. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/58476.