To cite package ‘curl’ in publications use:

  Ooms J (2024). _curl: A Modern and Flexible Web Client for R_. R
  package version 5.2.3, <https://CRAN.R-project.org/package=curl>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {curl: A Modern and Flexible Web Client for R},
    author = {Jeroen Ooms},
    year = {2024},
    note = {R package version 5.2.3},
    url = {https://CRAN.R-project.org/package=curl},
  }