To cite package "prefmod" in publications use:

JSS 2012 Citation

Hatzinger, R., & Dittrich, R. (2012). prefmod: An R Package for Modeling Preferences Based on Paired Comparisons, Rankings, or Ratings. Journal of Statistical Software, 48(10), 1-31. http://www.jstatsoft.org/v48/i10/

Package Citation

Hatzinger R and Maier MJ (2014). prefmod: Utilities to fit paired comparison models for preferences. R package version 0.8-32, http://CRAN.R-project.org/package=prefmod.

Corresponding BibTeX entries:

  @Article{,
    title = {{{prefmod}: An {R} Package for Modeling Preferences Based
      on Paired Comparisons, Rankings, or Ratings}},
    author = {Reinhold Hatzinger and Regina Dittrich},
    journal = {{Journal of Statistical Software}},
    year = {2012},
    volume = {48},
    number = {10},
    pages = {1--31},
    url = {http://www.jstatsoft.org/v48/i10/},
  }
  @Manual{prefmod.package,
    title = {{{prefmod}: Utilities to fit paired comparison models for
      preferences}},
    author = {Reinhold Hatzinger and Marco Johannes Maier},
    year = {2014},
    note = {{R package version 0.8-32}},
    url = {http://CRAN.R-project.org/package=prefmod},
  }