To cite catR in publications use:

David Magis, Gilles Raiche (2012). Random Generation of Response Patterns under Computerized Adaptive Testing with the R Package catR. Journal of Statistical Software, 48(8), 1-31. URL http://www.jstatsoft.org/v48/i08/.

Corresponding BibTeX entry:

  @Article{,
    title = {Random Generation of Response Patterns under Computerized
      Adaptive Testing with the {R} Package {catR}},
    author = {David Magis and Gilles Ra\^iche},
    journal = {Journal of Statistical Software},
    year = {2012},
    volume = {48},
    number = {8},
    pages = {1--31},
    url = {http://www.jstatsoft.org/v48/i08/},
  }