To cite package ‘pfr’ in publications use:

  Brown T (2023). _pfr: Interface to the 'C++' Library 'Pf'_. R package
  version 1.0.1, <https://CRAN.R-project.org/package=pfr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {pfr: Interface to the 'C++' Library 'Pf'},
    author = {Taylor Brown},
    year = {2023},
    note = {R package version 1.0.1},
    url = {https://CRAN.R-project.org/package=pfr},
  }