To cite package ‘ILSAstats’ in publications use:

  Christiansen A (2025). _ILSAstats: Statistics for International
  Large-Scale Assessments (ILSA)_. R package version 0.3.7,
  <https://CRAN.R-project.org/package=ILSAstats>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ILSAstats: Statistics for International Large-Scale Assessments (ILSA)},
    author = {Andrés Christiansen},
    year = {2025},
    note = {R package version 0.3.7},
    url = {https://CRAN.R-project.org/package=ILSAstats},
  }