To cite taxize in publications use:

Scott Chamberlain and Eduard Szocs (2013). taxize - taxonomic search and retrieval in R. F1000Research, 2:191. URL: http://f1000research.com/articles/2-191/v2.

Corresponding BibTeX entry:

  @Article{,
    title = {taxize - taxonomic search and retrieval in R},
    journal = {F1000Research},
    author = {{Scott Chamberlain} and {Eduard Szocs}},
    year = {2013},
    url = {http://f1000research.com/articles/2-191/v2},
  }