Lapage, S.; Sneath, P.; Lessel, E.; Skerman, V.; Seeliger, H.; Clark, W., eds. (1992), "Rules of Nomenclature with Recommendations", International Code of Nomenclature of Bacteria: Bacteriological Code (1990 revision ed.), Washington, DC: ASM Press, Rule 35, archived from the original on 5 April 2016, retrieved 27 October 2016
Lapage, S.; Sneath, P.; Lessel, E.; Skerman, V.; Seeliger, H.; Clark, W., eds. (1992), "Rules of Nomenclature with Recommendations", International Code of Nomenclature of Bacteria: Bacteriological Code (1990 revision ed.), Washington, DC: ASM Press, Rule 35, archived from the original on 5 April 2016, retrieved 27 October 2016