To cite package ‘model4you’ in publications use:

  Seibold H, Zeileis A, Hothorn T (2020). _model4you: Stratified and
  Personalised Models Based on Model-Based Trees and Forests_. R
  package version 0.9-7,
  <https://r-forge.r-project.org/projects/partykit>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {model4you: Stratified and Personalised Models Based on Model-Based Trees
and Forests},
    author = {Heidi Seibold and Achim Zeileis and Torsten Hothorn},
    year = {2020},
    note = {R package version 0.9-7},
    url = {https://r-forge.r-project.org/projects/partykit},
  }