To cite package ‘utf8’ in publications use:

  Perry PO (2026). _utf8: Unicode Text Processing_. R package version
  1.2.6.9012, <https://github.com/krlmlr/utf8>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {utf8: Unicode Text Processing},
    author = {Patrick O. Perry},
    year = {2026},
    note = {R package version 1.2.6.9012},
    url = {https://github.com/krlmlr/utf8},
  }