↑ Forey, Peter, & Janvier, Philippe (2000). "Agnathans and the origin of jawed vertebrates". In Gee, Henry. Shaking the tree: readings from Nature in the history of life. USA: University of Chicago Press; Nature/Macmillan Magazines. pp. 251–266. ISBN9780226284972.CS1 maint: Multiple names: authors list (link)
↑ Janvier, Philippe (2008). "Early Jawless Vertebrates and Cyclostome Origins". Zoological Science. 25 (10): 1045–1056. doi:10.2108/zsj.25.1045. PMID19267641.
↑ Nelson, J. S. (2006). Fishes of the World (4th ed.). New York: John Wiley and Sons, Inc. pp. 601 pp. ISBN0-471-25031-7.
