Polyong, Chan Pattama, and Anamai Thetkathuek. 2022. “Factors influencing the hematological parameters among laborers at a gas service station in Rayong Province, Thailand: 10.55131/jphd/2022/200304”. Journal of Public Health and Development 20 (3). Bangkok, Thailand:43-57. https://doi.org/10.55131/jphd/2022/200304.