To cite package ‘formatR’ in publications use:

  Xie Y (2024). _formatR: Format R Code Automatically_. R package
  version 1.14.1, <https://github.com/yihui/formatr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {formatR: Format R Code Automatically},
    author = {Yihui Xie},
    year = {2024},
    note = {R package version 1.14.1},
    url = {https://github.com/yihui/formatr},
  }