To cite APD, please use:

  Merino-Soto C (2026). “Response consistency for short scale items: R
  package for implementation of the average proportional distance.”
  _Ciencias Psicológicas_.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Response consistency for short scale items: R package for implementation of the average proportional distance},
    author = {César Merino-Soto},
    year = {2026},
    journal = {Ciencias Psicológicas},
  }

  Merino-Soto C (2026). _APD: Average Proportional Distance for Item
  Analysis from Scales_. R package version 1.0.1,
  <https://github.com/cmerinos/APD>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {APD: Average Proportional Distance for Item Analysis from Scales},
    author = {César Merino-Soto},
    year = {2026},
    note = {R package version 1.0.1},
    url = {https://github.com/cmerinos/APD},
  }