If you are using SILVA please cite:
Quast C, Pruesse E, Yilmaz P, Gerken J, Schweer T, Yarza P, Peplies J, Glockner 
FO (2013) The SILVA ribosomal RNA gene database project: improved data 
processing and web-based tools. Nucleic Acids Research 41:D590-D596
Yilmaz P, Parfrey LW, Yarza P, Gerken J, Pruesse E, Quast C, Schweer T,Peplies 
J, Ludwig W, Glockner FO (2014) The SILVA and "All-species Living Tree Project 
(LTP)" taxonomic frameworks. Nucleic Acid Res. 42:D643-D648
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