Chotayakul, Supatchaya. “COMPARISONS OF THE PURCHASING AND PRODUCTION LOT SIZING METHODS”. Srinakharinwirot University Journal of Sciences and Technology 15, no. 30, July-December (November 7, 2023): 1–13, Article 251594. accessed April 8, 2025. https://ph02.tci-thaijo.org/index.php/swujournal/article/view/251594.