Referência
Mora, C.; Tittensor, D. P.; Adl, S; Simpson, A. G. B.; Worm, B. (2011). How Many Species Are There on Earth and in the Ocean? PLoS Biology, 9(8): 1001127. doi: https://doi.org/10.1371/journal.pbio.1001127
Referência
LEWINSOHN, T. M., & PRADO, P. I. (2005). How Many Species Are There in Brazil? Conservation Biology, 19(3), 619–624. doi: https://doi.org/10.1111/j.1523-1739.2005.00680.x