To cite 'indicspecies' package in publications use:

De Caceres, M., Legendre, P. (2009). Associations between species and groups of sites: indices and statistical inference. Ecology, URL http://sites.google.com/site/miqueldecaceres/

Thank you for using 'indicspecies'

Corresponding BibTeX entry:

  @Manual{,
    title = {Associations between species and groups of sites: indices
      and statistical inference},
    author = {Miquel De Caceres and Pierre Legendre},
    journal = {Ecology},
    year = {2009},
    url = {http://sites.google.com/site/miqueldecaceres/},
  }