Citation
If you publish research that uses Sourcetracker2 you have to cite it as follows:
Knights D, Kuczynski J, Charlson ES, Zaneveld J, Mozer MC, Collman RG, Bushman FD, Knight R, Kelley ST. Bayesian community-wide culture-independent microbial source tracking. Nat Methods. 2011 Jul 17;8(9):761-3. http://doi.org/10.1038/nmeth.1650.