Hifni, Syaiful. “ANALISIS PERSEDIAAN KAPORIT UNIT IPA CENDANA PADA PDAM TIRTA KENCANA SAMARINDA”. OBOR: Oikonomia Borneo 1, no. 1 (April 15, 2019). Accessed April 24, 2026. https://ojs.uwgms.ac.id/index.php/oikonomia/article/view/1821.