M. Syafiq MY, S. Shaharuddin, and R. Andriyani, “Health Risk Assessment of Nitrate Exposure Originating from Gravity Feed System (GFS) Water: A Cross-Sectional Study in Hulu Langat, Selangor State, Malaysia”, Jurnal Bahana Kesehatan Masyarakat (Bahana of Journal Public Health), vol. 9, no. 2, pp. 93-97, Dec. 2025.