Siregar, A., J. P. Haumahu, E. Kaya, J. Putinella, R. G. Risamasu, and R. Soplanit. “Chemical Quality of Drinking Water from Community Wells”. Journal La Lifesci, Vol. 7, no. 3, June 2026, pp. 202-15, https://www.newinera.com/index.php/JournalLaLifesci/article/view/5631.