“PENGENDALIAN KUALITAS PRODUK PIPA DI PT.CITRA TUBINDO TBK”, comasiejournal, vol. 4, no. 3, hlm. 126–133, Jan 2021, Diakses: Okt 06, 2026. Tersedia pada: https://ejournal.upbatam.ac.id/index.php/comasiejournal/article/view/3425