Situmorang, Frenky, and Irvan Rolyesh Situmorang. “Education on the Physical Expenditure of Fertilizer Supplies Using the FIFO System at PT Kalimantan Hamparan Sawit”. Jurnal IPTEK Bagi Masyarakat 3, no. 2 (December 31, 2023): 85–91. Accessed October 13, 2025. https://journal.aira.or.id/index.php/j-ibm/article/view/739.