To cite package ‘crul’ in publications use:

  Chamberlain S (2024). _crul: HTTP Client_. R package version 1.5.0,
  <https://CRAN.R-project.org/package=crul>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {crul: HTTP Client},
    author = {Scott Chamberlain},
    year = {2024},
    note = {R package version 1.5.0},
    url = {https://CRAN.R-project.org/package=crul},
  }