To cite the 'PP' package in publications use:

  Reif, M. and Steinfeld, J. (2026). PP: Person Parameter Estimation. R
  package version 1.0.0. https://doi.org/10.32614/CRAN.package.PP

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{PP}: Person Parameter Estimation},
    author = {Manuel Reif and Jan Steinfeld},
    year = {2026},
    note = {R package version 1.0.0},
    doi = {10.32614/CRAN.package.PP},
    url = {https://github.com/manuelreif/PP},
  }