Rusmanjaya R, Widiyarta A. QUALITY OF DIRECT CUSTOMER COMPLAINTS SERVICE IN DELTA TIRTA REGIONAL DRINKING WATER COMPANIES IN SIDOARJO DISTRICT, SIDOARJO REGENCY. DIA [Internet]. 1Dec.2021 [cited 19Apr.2025];19(02):175 -187. Available from: https://jurnal.untag-sby.ac.id/index.php/dia/article/view/%235454