Sowmya Koneru, V.Pavan Karthik, P.Bhavya sri, M.Pushpa. “Feedback Mining Using NRC Lexicon”. International Journal of Advanced Science and Technology, Vol. 29, no. 06, May 2020, pp. 2989 -5, http://sersc.org/journals/index.php/IJAST/article/view/13831.