To cite psychotools in publications use

Zeileis A, Strobl C, Wickelmaier F, Komboz B, Kopf J, Schneider L, Debelak R (2025). psychotools: Infrastructure for Psychometric Modeling. R package version 0.7-5, https://CRAN.R-project.org/package=psychotools.

If you use IRT models, please cite

Schneider L, Strobl C, Zeileis A, Debelak R (2022). “An R Toolbox for Score-Based Measurement Invariance Tests in IRT Models.” Behavior Research Methods. doi:10.3758/s13428-021-01689-0, Forthcoming.

If you use anchor() or anchortest(), please cite

Strobl C, Kopf J, Kohler L, von Oertzen T, Zeileis A (2021). “Anchor Point Selection: Scale Alignment Based on an Inequality Criterion.” Applied Psychological Measurement, 45(3), 214–230. doi:10.1177/0146621621990743.

Corresponding BibTeX entries:

  @Manual{,
    title = {{psychotools}: Infrastructure for Psychometric Modeling},
    author = {Achim Zeileis and Carolin Strobl and Florian Wickelmaier
      and Basil Komboz and Julia Kopf and Lennart Schneider and Rudolf
      Debelak},
    year = {2025},
    note = {R package version 0.7-5},
    url = {https://CRAN.R-project.org/package=psychotools},
  }

  @Article{,
    title = {An {R} Toolbox for Score-Based Measurement Invariance
      Tests in {IRT} Models},
    author = {Lennart Schneider and Carolin Strobl and Achim Zeileis
      and Rudolf Debelak},
    journal = {Behavior Research Methods},
    year = {2022},
    note = {Forthcoming},
    doi = {10.3758/s13428-021-01689-0},
  }

  @Article{,
    title = {Anchor Point Selection: Scale Alignment Based on an
      Inequality Criterion},
    author = {Carolin Strobl and Julia Kopf and Lucas Kohler and Timo
      {von Oertzen} and Achim Zeileis},
    journal = {Applied Psychological Measurement},
    year = {2021},
    volume = {45},
    number = {3},
    pages = {214--230},
    doi = {10.1177/0146621621990743},
  }