To cite klausuR in publications use:

Michalke, M. (2012). klausuR: Multiple Choice Test Evaluation (Version 0.12-5). Available from http://r-forge.r-project.org/projects/klausur

Corresponding BibTeX entry:

  @Manual{,
    title = {klausuR: Multiple Choice Test Evaluation},
    author = {Meik Michalke},
    year = {2012},
    note = {(Version 0.12-5)},
    url = {http://r-forge.r-project.org/projects/klausur},
  }