Cavalier-Smith, T (2002). "The neomuran origin of archaebacteria, the negibacterial root of the universal tree and bacterial megaclassification". Int. J. Syst. Evol. Microbiol.52 (Pt 1): 7–76. PMID11837318.
Burggraf, S; Huber H; Stetter KO (1997). "Reclassification of the crenarchael orders and families in accordance with 16S rRNA sequence data". Int. J. Syst. Bacteriol.47 (3): 657–660. PMID9226896. doi:10.1099/00207713-47-3-657.
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. PMID11541975. doi:10.1016/S0723-2020(84)80054-5.
Libros científicos
Reysenbach, AL (2001). "Class I. Thermoprotei class. nov.". En DR Boone and 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.". En DR Boone and 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.