Purba, Djuli Sjafei. “ANALISIS KINERJA PERUSAHAAN DAERAH AIR MINUM DI SUMATERA UTARA”. Jurnal Ilmiah Accusi 2, no. 1 (May 21, 2020): 1–15. Accessed May 4, 2024. https://jurnal.usi.ac.id/index.php/ACCUSI/article/view/47.