To cite koRpus in publications use:

Michalke, M. (2013). koRpus: An R Package for Text Analysis (Version 0.04-40). Available from http://reaktanz.de/?c=hacking&s=koRpus

Corresponding BibTeX entry:

  @Manual{,
    title = {koRpus: An R Package for Text Analysis},
    author = {Meik Michalke},
    year = {2013},
    note = {(Version 0.04-40)},
    url = {http://reaktanz.de/?c=hacking&s=koRpus},
  }