A. S. Nasution, O. B. Simbolon, T. Muliawati, T. S. Edriani, D. M. M. Noor, and R. Fauzi, “Raw Material Inventory Control Using The Period Order Quantity (POQ) Method to Reduce Stockout and Overstock Risks”, VoJ, vol. 7, no. 2, pp. 97–110, Aug. 2025.