Lestari, Nurhayati, and Harlinda Rasvi Nabela. “Analisis Persediaan Material Gypsum, Pozzolan Dan Batu Bara: Studi Kasus PT Semen Padang ”. Innovative: Journal Of Social Science Research 3, no. 2 (June 5, 2023): 7861–7869. Accessed April 21, 2026. https://j-innovative.org/index.php/Innovative/article/view/1299.