Soemapradja, Tomy G. “Analisis Kinerja Kontrak Berjangka Komoditi Pada Tokyo Grain Exchange – Jepang”. Journal The Winners 6, no. 1 (March 31, 2005): 1-22. Accessed July 22, 2024. https://journal.binus.ac.id/index.php/winners/article/view/483.