To cite package ‘surf’ in publications use:

  Coene J (2025). _surf: Cross-site Request Forgery Protection for
  'Ambiorix' Applications_. R package version 0.0.0.9000,
  <https://github.com/ambiorix-web/surf>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {surf: Cross-site Request Forgery Protection for 'Ambiorix'
Applications},
    author = {John Coene},
    year = {2025},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/ambiorix-web/surf},
  }