See the NCBI webpage on Methanothermococcus. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19. /wiki/National_Center_for_Biotechnology_Information ↩
David R. Boone; Richard W. Castenholz, eds. (2012-01-13). Bergey's Manual of Systematic Bacteriology. Vol. 1 (2 ed.). Springer Science & Business Media. p. 242. ISBN 978-0387216096. Retrieved 2016-09-04. 978-0387216096 ↩