To cite package adhoc in publications use:

Sonet G, Jordaens K, Nagy ZT, Breman FC, De Meyer M, Backeljau T & Virgilio M(2013) Adhoc: an R package to calculate ad hoc distance thresholds for DNA barcoding identification, Zookeys, 365:329-336

Corresponding BibTeX entry:

  @Article{,
    title = {Adhoc: an R package to calculate ad hoc distance
      thresholds for DNA barcoding identification},
    author = {Gontran Sonet and Kurt Jordaens and Zoltan T. Nagy and
      Floris C. Breman and Marc {De Meyer} and Thierry Backeljau and
      Massimiliano Virgilio},
    year = {2013},
    journal = {Zookeys},
    volume = {365},
    pages = {329--336},
    url = {http://zookeys.pensoft.net/articles.php?id=3057},
  }