To cite package 'CITAN' in publications use:

Marek Gagolewski (2011). Bibliometric impact assessment with R and the CITAN package. Journal of Informetrics. In press, doi:10.1016/j.joi.2011.06.006.

Corresponding BibTeX entry:

  @Article{,
    title = {Bibliometric impact assessment with {R} and the {CITAN}
      package},
    author = {Marek Gagolewski},
    journal = {Journal of Informetrics},
    year = {2011},
    url = {http://www.ibspan.waw.pl/~gagolews/CITAN/},
    doi = {10.1016/j.joi.2011.06.006},
  }