Perdana, R. S., and A. Pinandito. “Combining Likes-Retweet Analysis and Naive Bayes Classifier Within Twitter for Sentiment Analysis”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 10, no. 1-8, Feb. 2018, pp. 41-46, https://jtec.utem.edu.my/jtec/article/view/3732.