Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D. (red.) (2011). ""Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist."". Species 2000: Reading, UK.. Diakses pado 24 September 2012.