To cite package ‘withr’ in publications use:

  Hester J, Henry L, Müller K, Ushey K, Wickham H, Chang W (2024).
  _withr: Run Code 'With' Temporarily Modified Global State_. R package
  version 3.0.2, <https://CRAN.R-project.org/package=withr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {withr: Run Code 'With' Temporarily Modified Global State},
    author = {Jim Hester and Lionel Henry and Kirill Müller and Kevin Ushey and Hadley Wickham and Winston Chang},
    year = {2024},
    note = {R package version 3.0.2},
    url = {https://CRAN.R-project.org/package=withr},
  }