Rushayati, S. , Meilani, R. , Hermawan, R.. "The Threats of Deforestation, Forest Fire, and CO2 Emission toward Giam Siak Kecil Bukit Batu Biosphere Reserve in Riau, Indonesia". World Academy of Science, Engineering and Technology, Open Science Index 104, International Journal of Environmental and Ecological Engineering (2015), 9(8), 1013 - 1020.