To cite package ‘RCurl’ in publications use:

  Temple Lang D (2026). _RCurl: General Network (HTTP/FTP/...) Client
  Interface for R_. R package version 1.98-1.20.9999,
  <https://codeberg.org/aitap/rcurl>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {RCurl: General Network (HTTP/FTP/...) Client Interface for R},
    author = {Duncan {Temple Lang}},
    year = {2026},
    note = {R package version 1.98-1.20.9999},
    url = {https://codeberg.org/aitap/rcurl},
  }