nasution, A., and claudia indriya. “Pembelian Bahan Baku Optimal Ready Mix Concrete Dengan Metode Economic Order Quantity: Pembelian Bahan Baku Optimal Ready Mix Concrete Dengan Metode Economic Order Quantity”. Jurnal Sistem Teknik Industri, vol. 22, no. 2, July 2020, pp. 25-32, doi:10.32734/jsti.v22i2.3827.