To cite FFTrees in derivations and publications use:

Phillips ND, Neth H, Woike JK, Gaissmaier W (2017). “FFTrees: A toolbox to create, visualize, and evaluate fast-and-frugal decision trees.” Judgment and Decision Making, 12(4), 344–368. R package (version 1.6.6, July 18, 2022), https://CRAN.R-project.org/package=FFTrees.

Corresponding BibTeX entry:

  @Article{,
    title = {FFTrees: A toolbox to create, visualize, and evaluate
      fast-and-frugal decision trees},
    author = {Nathaniel D Phillips and Hansjörg Neth and Jan K Woike
      and Wolfgang Gaissmaier},
    year = {2017},
    journal = {Judgment and Decision Making},
    volume = {12},
    number = {4},
    pages = {344--368},
    address = {PDF at
      <https://journal.sjdm.org/17/17217/jdm17217.pdf>},
    note = {R package (version 1.6.6, July 18, 2022)},
    url = {https://CRAN.R-project.org/package=FFTrees},
  }