DJUMA, A. W., & OLLA, F. (2016). THE EXAMINATION OF TOTAL HARDNESS ON DRINKING WATER WITH BOILING AND FILTER PROCESS USING COMPLEXOMETRY METHOD. JURNAL INFO KESEHATAN, 14(1), 1168–1177. Retrieved from http://jurnal.poltekkeskupang.ac.id/index.php/infokes/article/view/105