Syafaruddin, S. et al. 2020. STUDY OF CLEAN WATER DISTRIBUTION SERVICES FROM BAHSIKAM SPRINGS IN PDAM TIRTAULI, PEMATANGSIANTAR CITY. International Conference on Health Science, Green Economics, Educational Review and Technology. 2, (Dec. 2020), 269–286. DOI:https://doi.org/10.54443/ihert.v2i.34.