To cite SPECIES in publications use:
Ji-Ping Wang (2011). SPECIES: An R Package for Species Richness Estimation. Journal of Statistical Software, 40(9), 1-15. URL http://www.jstatsoft.org/v40/i09/.
Corresponding BibTeX entry:
@Article{, title = {{SPECIES}: An {R} Package for Species Richness Estimation}, author = {Ji-Ping Wang}, journal = {Journal of Statistical Software}, year = {2011}, volume = {40}, number = {9}, pages = {1--15}, url = {http://www.jstatsoft.org/v40/i09/}, }