Article

Stackebrandt, E., Murray, R.G.E. & Trüper, H.G. 1988. Proteobacteria classis nov., a Name for the Phylogenetic Taxon That Includes the Purple Bacteria and Their Relatives. Int. J. Syst. Bacteriol. 38 (2): 321-325.

Original Classification (root)

(Class) Proteobacteria Stackebrandt et al. 1988