Kamaruddin, Kamaruddin, Yusri Hazmi, Raja Masbar, Sofyan Syahnur, and M. Shabri Abd. Majid. 2021. “Asymmetric Impact of World Oil Prices on Marketing Margins: Application of NARDL Model for the Indonesian Coffee”. International Journal of Energy Economics and Policy 11 (6):212-20. https://www.econjournals.com/index.php/ijeep/article/view/11857.