Citation
If you publish research that uses esprit you have to cite it as follows:
Sun, Y., Cai, Y., Liu, L., Yu, F., Farrell, M. L., McKendree, W., & Farmerie, W. (2009). ESPRIT: Estimating species richness using large collections of 16S rRNA pyrosequences. Nucleic Acids Research, 37(10), e76. https://doi.org/10.1093/nar/gkp285