To cite package ‘psy’ in publications use:

Falissard B (2022). psy: Various Procedures Used in Psychometrics. R package version 1.2, https://CRAN.R-project.org/package=psy.

Corresponding BibTeX entry:

  @Manual{,
    title = {psy: Various Procedures Used in Psychometrics},
    author = {Bruno Falissard},
    year = {2022},
    note = {R package version 1.2},
    url = {https://CRAN.R-project.org/package=psy},
  }