To cite package ‘Sibyl’ in publications use:

  Assentato L, Polder M (2026). _Sibyl: Sibyl_. R package version 1.0,
  <https://github.com/headonpillow/sibyl>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Sibyl: Sibyl},
    author = {Lorenzo Assentato and Magdalena Polder},
    year = {2026},
    note = {R package version 1.0},
    url = {https://github.com/headonpillow/sibyl},
  }