To cite package ‘arg’ in publications use:

  Rogiers B (2025). _arg: A simple modern interface to command line
  arguments_. R package version 0.0.0.9000,
  <https://github.com/rogiersbart/arg>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {arg: A simple modern interface to command line arguments},
    author = {Bart Rogiers},
    year = {2025},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/rogiersbart/arg},
  }