To cite package ‘opencis’ in publications use:

  Meleiro H (2026). _opencis: Import Data from Spanish Sociological
  Research Center (CIS)_. R package version 0.1.0,
  <https://github.com/hmeleiro/opencis>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {opencis: Import Data from Spanish Sociological Research Center (CIS)},
    author = {Héctor Meleiro},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://github.com/hmeleiro/opencis},
  }