To cite psychotools in publications use:

Zeileis A, Strobl C, Wickelmaier F, Komboz B, Kopf J (2020). psychotools: Infrastructure for Psychometric Modeling. R package version 0.5-1, https://CRAN.R-project.org/package=psychotools.

If you use the forward anchor class in anchor() or anchortest(), please cite:

Kopf J, Strobl C, Zeileis A (2015). “A Framework for Anchor Methods and an Iterative Forward Approach for DIF Detection.” Applied Psychological Measurement, 39(2), 83–103. doi: 10.1177/0146621614544195.

If you use the MTT, MPT, MP or NST anchor selections in anchor() or anchortest(), please cite:

Kopf J, Strobl C, Zeileis A (2015). “Anchor Selection Strategies for DIF Analysis: Review, Assessment, and New Approaches.” Educational and Psychological Measurement, 75(1), 22–56. doi: 10.1177/0013164414529792.

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},
    year = {2020},
    note = {R package version 0.5-1},
    url = {https://CRAN.R-project.org/package=psychotools},
  }

  @Article{,
    title = {A Framework for Anchor Methods and an Iterative Forward
      Approach for {DIF} Detection},
    author = {Julia Kopf and Carolin Strobl and Achim Zeileis},
    journal = {Applied Psychological Measurement},
    year = {2015},
    volume = {39},
    number = {2},
    pages = {83--103},
    doi = {10.1177/0146621614544195},
  }

  @Article{,
    title = {Anchor Selection Strategies for {DIF} Analysis: Review,
      Assessment, and New Approaches},
    author = {Julia Kopf and Carolin Strobl and Achim Zeileis},
    journal = {Educational and Psychological Measurement},
    year = {2015},
    volume = {75},
    number = {1},
    pages = {22--56},
    doi = {10.1177/0013164414529792},
  }