To cite package ‘questionr’ in publications use:

  Barnier J, Briatte F, Larmarange J (2023). _questionr: Functions to
  Make Surveys Processing Easier_. R package version 0.7.8.9000,
  <https://github.com/juba/questionr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {questionr: Functions to Make Surveys Processing Easier},
    author = {Julien Barnier and François Briatte and Joseph Larmarange},
    year = {2023},
    note = {R package version 0.7.8.9000},
    url = {https://github.com/juba/questionr},
  }