Nughthoh Arfawi Kurdhi และ Rumi Iqbal Doewes. (2019) Periodic review inventory policy with variable ordering cost, lead time, and backorder rate. <i>Songklanakarin Journal of Science and Technology</i>, <i>41</i>(1), 1-11.Nughthoh Arfawi Kurdhi และ Rumi Iqbal Doewes. "Periodic review inventory policy with variable ordering cost, lead time, and backorder rate". Songklanakarin Journal of Science and Technology 41 (2019):1-11.Nughthoh Arfawi Kurdhi และ Rumi Iqbal Doewes. Periodic review inventory policy with variable ordering cost, lead time, and backorder rate. Research and Development Office, Prince of Songkla University:ม.ป.ท. 2019.