To cite psychotools in publications use:

Achim Zeileis, Carolin Strobl, Florian Wickelmaier, Basil Komboz, Julia Kopf (2018). psychotools: Infrastructure for Psychometric Modeling. R package version 0.5-0. URL https://CRAN.R-project.org/package=psychotools

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

Julia Kopf, Achim Zeileis, Carolin Strobl (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:

Julia Kopf, Achim Zeileis, Carolin Strobl (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 = {2018},
    note = {R package version 0.5-0},
    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},
  }