Syafaruddin, S., Bahmani-Oskooee, M., Tony Sohdin Martua Simanjuntak, E., Samosir, W. and Delfahedah, Y. 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.