Wulandari, Anis Erma, Harianto Harianto, and Bustanul Arifin. “The Interdependence of Indonesia Coffee Futures and Spot Market and Its Relationship With Offshore Futures Market”. Jurnal Manajemen & Agribisnis 16, no. 1 (March 24, 2019): 30. Accessed June 28, 2022. https://jma.journal.ipb.ac.id/index.php/jmagr/article/view/25417.