B. Thongmak and J. Phromin, “Environmental Health Literacy and Preventive Behaviors Against Health Effects from Particulate Matter Less Than 2.5 Microns (PM2.5) among Village Health Volunteers (VHVs) in Sukhothai Province”, TH. J. of Health Edu., vol. 48, no. 3, pp. 152–167, Dec. 2025.