Md Yusoff, Muhammad Syafiq, Shaharuddin Mohd Sham, and Retno Adriyani. “Health Risk From Nitrate Exposure in Gravity Feed System, GFS Water Among Residents of 20th Mile Village, Hulu Langat, Selangor”. JPKM: Jurnal Profesi Kesehatan Masyarakat 6, no. 2 (October 30, 2025): 129–139. Accessed November 29, 2025. https://jurnal.stikes-bhm.ac.id/index.php/jpkm/article/view/691.