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

Ardia D, Bluteau K, Borms S, Boudt K (2020). “The R Package sentometrics to Compute, Aggregate and Predict with Textual Sentiment.” Forthcoming in Journal of Statistical Software. doi: 10.2139/ssrn.3067734.

Corresponding BibTeX entry:

  @Article{ArdiaBluteauBormsBoudt2020,
    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},
    journal = {Forthcoming in Journal of Statistical Software},
    doi = {10.2139/ssrn.3067734},
    year = {2020},
  }