To cite the R package 'sentometrics' in publications use:

David Ardia, Keven Bluteau, Samuel Borms and Kris Boudt (2018). The R Package sentometrics to Compute, Aggregate and Predict with Textual Sentiment. Available at: https://ssrn.com/abstract=3067734.

Corresponding BibTeX entry:

  @Manual{,
    title = {The R Package sentometrics to Compute, Aggregate and
      Predict with Textual Sentiment},
    author = {David Ardia and Keven Bluteau and Samuel Borms and Kris
      Boudt},
    url = {https://ssrn.com/abstract=3067734},
    year = {2018},
  }