Harini, H., Yunastiti Purwaningsih, Emi Widiyanti, and Malik Cahyadin. “Trading System of Food Commodity”. Economic Journal of Emerging Markets 9, no. 2 (October 1, 2017): 172–180. Accessed May 1, 2024. https://journal.uii.ac.id/JEP/article/view/7127.