Rijal, S., M. B. Saleh, I. N. S. Jaya, and T. Tiryana. “Deforestation Profile of Regency Level in Sumatra”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 25, no. 2, Feb. 2016, pp. 385-02, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/5243.