Garrity, G. M; Boone, D. R. ; Castenholz, R. W. ed. 2001: Bergey's Manual of Systematic Bacteriology. 2nd ed. Williams & Wilkins.
The Global Biodiversity Information Facility:
GBIF Backbone Taxonomy, 2013-07-01.
Accessed via http://www.gbif.org/species/87 on 2014-12-19
This backbone name usage exists because it was found in another checklist at the time the backbone was built. The primary source name usage has since been removed from the portal.