FEINERER, I.; HORNIK, K.; MEYER, D. Text Mining Infrastructure in R. Journal of Statistical Software, [S. l.], v. 25, n. 5, p. 1–54, 2008. DOI: 10.18637/jss.v025.i05. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v025i05. Acesso em: 26 oct. 2021.