To cite package ‘friendlynumber’ in publications use:

  Sansom E (2025). _friendlynumber: Translate Numbers into Number
  Words_. R package version 1.0.0,
  <https://github.com/ethansansom/friendlynumber>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {friendlynumber: Translate Numbers into Number Words},
    author = {Ethan Sansom},
    year = {2025},
    note = {R package version 1.0.0},
    url = {https://github.com/ethansansom/friendlynumber},
  }