Ardia, David, Keven Bluteau, Samuel Borms, and Kris Boudt. “The R Package Sentometrics to Compute, Aggregate, and Predict With Textual Sentiment”. Journal of Statistical Software 99, no. 2 (August 18, 2021): 1–40. Accessed October 17, 2021. https://www.jstatsoft.org/index.php/jss/article/view/v099i02.