Maspul, Kurniawan Arif. “Improving the Fourth Wave of Coffee in Sustaining the Coffee Value Chain As Economic Growth in Istanbul”. EKOMA : Jurnal Ekonomi, Manajemen, Akuntansi 2, no. 2 (April 7, 2023): 375–397. Accessed August 12, 2026. https://al-haramjournal.co.id/EKOMA/article/view/1476.