To cite BiodiversityR in publications use:

Kindt R, Coe R (2005). Tree diversity analysis. A manual and software for common statistical methods for ecological and biodiversity studies. World Agroforestry Centre (ICRAF), Nairobi (Kenya). ISBN 92-9059-179-X, http://www.worldagroforestry.org/output/tree-diversity-analysis.

Corresponding BibTeX entry:

  @Book{,
    title = {Tree diversity analysis. A manual and software for common
      statistical methods for ecological and biodiversity studies},
    author = {R. Kindt and R. Coe},
    publisher = {World Agroforestry Centre (ICRAF)},
    address = {Nairobi (Kenya)},
    year = {2005},
    note = {ISBN 92-9059-179-X},
    url =
      {http://www.worldagroforestry.org/output/tree-diversity-analysis},
  }