To cite package ‘BOE’ in publications use:

  Revilla Sancho L (2024). _BOE: Work with the Boletin Oficial del
  Estado of Spain_. R package version 0.1.8.9007,
  <https://github.com/ropenspain/boe>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {BOE: Work with the Boletin Oficial del Estado of Spain},
    author = {Lluís {Revilla Sancho}},
    year = {2024},
    note = {R package version 0.1.8.9007},
    url = {https://github.com/ropenspain/boe},
  }