Panjaitan JRH, Simbolon NI, Pasaribu TJ. PENGARUH KOAGULAN DAN ANALISIS GROSS PROFIT MARGIN TERHADAP KADAR MUTU KARET REMAH SIR 20. LUMBUNG [Internet]. 2022 Aug. 31 [cited 2025 Nov. 15];21(2):55-62. Available from: http://jurnalpolitanipyk.ac.id/index.php/LUMBUNG/article/view/517