Woese, CR; Gupta R; Hahn CM; Zillig W; Tu J (1984). "The phylogenetic relationships of three sulfur dependent archaebacteria". Syst. Appl. Microbiol. 5: 97–105. doi:10.1016/S0723-2020(84)80054-5. PMID11541975.
Scientific books
Reysenbach, AL (2001). "Class I. Thermoprotei class. nov.". In DR Boone; RW Castenholz (eds.). Bergey's Manual of Systematic Bacteriology Volume 1: The Archaea and the deeply branching and phototrophic Bacteria (2nd ed.). New York: Springer Verlag. p. 169. ISBN978-0-387-98771-2.
Garrity GM; Holt JG (2001). "Phylum AI. Crenarchaeota phy. nov.". In DR Boone; RW Castenholz (eds.). Bergey's Manual of Systematic Bacteriology Volume 1: The Archaea and the deeply branching and phototrophic Bacteria (2nd ed.). New York: Springer Verlag. p. 169. ISBN978-0-387-98771-2.