William Revelle (2026). psych: Procedures for Psychological, Psychometric, and Personality Research. Northwestern University, Evanston, Illinois. R package version 2.6.1, https://CRAN.R-project.org/package=psych.

Corresponding BibTeX entry:

  @Manual{,
    title = {psych: Procedures for Psychological, Psychometric, and
      Personality Research},
    author = {{William Revelle}},
    organization = {Northwestern University},
    address = {Evanston, Illinois},
    year = {2026},
    note = {R package version 2.6.1},
    url = {https://CRAN.R-project.org/package=psych},
  }