To cite party in publications use:

If ctree() is used cite:

Torsten Hothorn, Kurt Hornik and Achim Zeileis (2006). Unbiased Recursive Partitioning: A Conditional Inference Framework. Journal of Computational and Graphical Statistics, 15(3), 651--674.

If mob() is used cite:

Achim Zeileis, Torsten Hothorn and Kurt Hornik (2008). Model-Based Recursive Partitioning. Journal of Computational and Graphical Statistics, 17(2), 492--514.

If cforest() is used cite:

Torsten Hothorn, Peter Buehlmann, Sandrine Dudoit, Annette Molinaro and Mark Van Der Laan (2006). Survival Ensembles. Biostatistics, 7(3), 355--373.
Carolin Strobl, Anne-Laure Boulesteix, Achim Zeileis and Torsten Hothorn (2007). Bias in Random Forest Variable Importance Measures: Illustrations, Sources and a Solution. BMC Bioinformatics, 8(25). URL http://www.biomedcentral.com/1471-2105/8/25.
Carolin Strobl, Anne-Laure Boulesteix, Thomas Kneib, Thomas Augustin and Achim Zeileis (2008). Conditional Variable Importance for Random Forests. BMC Bioinformatics, 9(307). URL http://www.biomedcentral.com/1471-2105/9/307.

Corresponding BibTeX entries:

  @Article{,
    title = {Unbiased Recursive Partitioning: A Conditional Inference
      Framework},
    author = {Torsten Hothorn and Kurt Hornik and Achim Zeileis},
    journal = {Journal of Computational and Graphical Statistics},
    year = {2006},
    volume = {15},
    number = {3},
    pages = {651--674},
  }
  @Article{,
    title = {Model-Based Recursive Partitioning},
    author = {Achim Zeileis and Torsten Hothorn and Kurt Hornik},
    journal = {Journal of Computational and Graphical Statistics},
    year = {2008},
    volume = {17},
    number = {2},
    pages = {492--514},
  }
  @Article{,
    title = {Survival Ensembles},
    author = {Torsten Hothorn and Peter Buehlmann and Sandrine Dudoit
      and Annette Molinaro and Mark Van Der Laan},
    journal = {Biostatistics},
    year = {2006},
    volume = {7},
    number = {3},
    pages = {355--373},
  }
  @Article{,
    title = {Bias in Random Forest Variable Importance Measures:
      Illustrations, Sources and a Solution},
    author = {Carolin Strobl and Anne-Laure Boulesteix and Achim
      Zeileis and Torsten Hothorn},
    journal = {BMC Bioinformatics},
    year = {2007},
    volume = {8},
    number = {25},
    url = {http://www.biomedcentral.com/1471-2105/8/25},
  }
  @Article{,
    title = {Conditional Variable Importance for Random Forests},
    author = {Carolin Strobl and Anne-Laure Boulesteix and Thomas Kneib
      and Thomas Augustin and Achim Zeileis},
    journal = {BMC Bioinformatics},
    year = {2008},
    volume = {9},
    number = {307},
    url = {http://www.biomedcentral.com/1471-2105/9/307},
  }