Matthew N. O. Sadiku, Yu Zhou, and Sarhan M. Musa. “Natural Language Processing”. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE, vol. 4, no. 5, May 2018, pp. 68-70, doi:10.31695/IJASRE.2018.32708.