To cite package ‘Rapp’ in publications use:

  Kalinowski T (2024). _Rapp: Easily Build Command Line Applications_.
  R package version 0.2.0.9000, <https://github.com/r-lib/rapp>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Rapp: Easily Build Command Line Applications},
    author = {Tomasz Kalinowski},
    year = {2024},
    note = {R package version 0.2.0.9000},
    url = {https://github.com/r-lib/rapp},
  }