The Prokaryotes Vol. 5: Proteobacteria: Alpha and Beta Subclasses - Falkow, Stanley; Rosenberg, Eugene; Schleifer, Karl-Heinz.; Stackebrandt, Erko.; SpringerLink (Online service) (New York, NY : Springer New York : Imprint: Springer, 2006)
From the contents: Proteobacteria -- Alpha Subclass -- Beta Subclass.
Keywords: Microbiology; Medical microbiology; Microbiology; Medical Microbiology