Syahril, S., R. Masbar, S. Syahnur, S. A. Majid, T. Zulham, J. Saputra, S. Badli, and I. Irmayani. “The Effect of Global Prices of Crude Palm Oil, Marketing Margins and Palm Oil Plantations on the Environmental Destruction: An Application of Johansen Cointegration Approach”. International Journal of Energy Economics and Policy, vol. 9, no. 4, June 2019, pp. 305-12,