Nasir, A.G., and Shehu, A. “Current Status in the Conversion of Lignocellulosic Biomass to Liquid (BtL) Biofuels”. International Journal of Science for Global Sustainability, vol. 6, no. 3, Oct. 2020, p. 10, https://www.fugus-ijsgs.com.ng/index.php/ijsgs/article/view/96.