To cite package 'CITAN' in publications use:

Gagolewski, M. (2011). Bibliometric impact assessment with R and the CITAN package. Journal of Informetrics 5(4), pp. 678--692.

Corresponding BibTeX entry:

  @Article{,
    title = {Bibliometric impact assessment with {R} and the {CITAN}
      package},
    author = {Marek Gagolewski},
    journal = {Journal of Informetrics},
    year = {2011},
    volume = {5},
    number = {4},
    pages = {678--692},
  }