To cite package ‘NLPclient’ in publications use:

  Schwendinger F, Hornik K (2019). _NLPclient: Stanford 'CoreNLP'
  Annotation Client_. R package version 1.0,
  <https://CRAN.R-project.org/package=NLPclient>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {NLPclient: Stanford 'CoreNLP' Annotation Client},
    author = {Florian Schwendinger and Kurt Hornik},
    year = {2019},
    note = {R package version 1.0},
    url = {https://CRAN.R-project.org/package=NLPclient},
  }