To cite package ‘finlex’ in publications use:

  Vepsäläinen K (2026). _finlex: Access Open Data from the Finnish
  'Finlex' Legislative Database_. R package version 0.1.0,
  <https://CRAN.R-project.org/package=finlex>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {finlex: Access Open Data from the Finnish 'Finlex' Legislative Database},
    author = {Kristian Vepsäläinen},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=finlex},
  }