Herdini, Hadi V, Trianisa Novalina. Analisis kesadahan total (CaCO3), kalsium (Ca2+), magnesium (Mg2+) pada air sumur tanah di Jakarta Utara. tekno [Internet]. 2023Jan.31 [cited 2024May3];10(1):1-11. Available from: https://jurnal.sttmcileungsi.ac.id/index.php/tekno/article/view/192