W. . . Phetliap, S. Hanklang, P. Putna, K. Yoosamran, S. Chanaphant, and P. Keankarn, “Working Conditions, Health Risks and Quality of Life Among Informal Older Workers in Nong Ngu-Leam Sub-district, Chaloem Phrakiat District, Nakhon Ratchasima Province”, Journal of the office of disease prevention and control 9 Nakhon Ratchasima, vol. 29, no. 3, pp. 19–34, Aug. 2023.