To cite spider in a publication, please use:

Brown SDJ, Collins RA, Boyer S, Lefort M, Malumbres-Olarte J, Vink CJ, Cruickshank RH (2012). “SPIDER: an R package for the analysis of species identity and evolution, with particular reference to DNA barcoding.” Molecular Ecology Resources, 12, 562–565.

As spider is developing rapidly, you may want to cite also its version number (found with 'library(help = spider)').

Corresponding BibTeX entry:

  @Article{,
    title = {{SPIDER}: an {R} package for the analysis of species
      identity and evolution, with particular reference to {DNA}
      barcoding},
    author = {Samuel D. J. Brown and Rupert A. Collins and Stephane
      Boyer and Marie-Caroline Lefort and Jagoba Malumbres-Olarte and
      Cor J. Vink and Robert H. Cruickshank},
    journal = {Molecular Ecology Resources},
    year = {2012},
    volume = {12},
    pages = {562--565},
  }