“ANALISIS PENENTUAN KARAKTERISTIK KUALITAS PRODUK PROTECTOR DI PT. CITRA TUBINDO TBK”, comasiejournal, vol. 4, no. 5, hlm. 62–67, Jan 2021, Diakses: Okt 06, 2026. Tersedia pada: https://ejournal.upbatam.ac.id/index.php/comasiejournal/article/view/3484