Bentivoglio, D., A. Finco, and G. Bucci. “Factors Affecting the Indonesian Palm Oil Market in Food and Fuel Industry: Evidence from a Time Series Analysis”. International Journal of Energy Economics and Policy, vol. 8, no. 5, Sept. 2018, pp. 49-57, https://econjournals.com/index.php/ijeep/article/view/6795.