To cite package ‘retroharmonize’ in publications use:

  Antal D (2026). _retroharmonize: Ex Post Survey Data Harmonization_.
  R package version 0.2.8,
  <https://github.com/dataobservatory-eu/retroharmonize>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {retroharmonize: Ex Post Survey Data Harmonization},
    author = {Daniel Antal},
    year = {2026},
    note = {R package version 0.2.8},
    url = {https://github.com/dataobservatory-eu/retroharmonize},
  }