Hugenholtz P, Stackebrandt E (November 2004). "Reclassification of Sphaerobacter thermophilus from the subclass Sphaerobacteridae in the phylum Actinobacteria to the class Thermomicrobia (emended description) in the phylum Chloroflexi (emended description)". International Journal of Systematic and Evolutionary Microbiology. 54 (Pt 6): 2049–51. doi:10.1099/ijs.0.03028-0. PMID15545432.
Hugenholtz P, Stackebrandt E (November 2004). "Reclassification of Sphaerobacter thermophilus from the subclass Sphaerobacteridae in the phylum Actinobacteria to the class Thermomicrobia (emended description) in the phylum Chloroflexi (emended description)". International Journal of Systematic and Evolutionary Microbiology. 54 (Pt 6): 2049–51. doi:10.1099/ijs.0.03028-0. PMID15545432.