{{sfn|Rosenberg|DeLong|Lory|Stackebrandt|2014|p=}}

* {{cite book | last=Rosenberg | first=Eugene | last2=DeLong | first2=Edward F. | last3=Lory | first3=Stephen | last4=Stackebrandt | first4=Erko | last5=Thompson | first5=Fabiano | last6=Rosenberg | first6=Eugene | title=The Prokaryotes: Alphaproteobacteria and Betaproteobacteria | publisher=Springer Berlin Heidelberg Springer e-books Imprint: Springer | publication-place=Berlin, Heidelberg | date=2014 | isbn=978-3-642-30197-1}}

<ref name="m250">{{cite book | last=Rosenberg | first=Eugene | last2=DeLong | first2=Edward F. | last3=Lory | first3=Stephen | last4=Stackebrandt | first4=Erko | last5=Thompson | first5=Fabiano | last6=Rosenberg | first6=Eugene | title=The Prokaryotes: Alphaproteobacteria and Betaproteobacteria | publisher=Springer Berlin Heidelberg Springer e-books Imprint: Springer | publication-place=Berlin, Heidelberg | date=2014 | isbn=978-3-642-30197-1 | page=}}</ref>