To cite package ‘punycoder’ in publications use:

  Turczynski B (2026). _punycoder: Unicode and Punycode Domain Name
  Processing_. R package version 1.0.0,
  <https://CRAN.R-project.org/package=punycoder>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {punycoder: Unicode and Punycode Domain Name Processing},
    author = {Bart Turczynski},
    year = {2026},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=punycoder},
  }