Groh, S. "Appendix"(PDF). Patterns of diversification in osteostracan evolution (M.S.). Uppsala University.
palass.org
cdn.palass.org
White, E. I. "On Cephalaspis lyelli Agassiz." Palaeontology 1.2 (1958): 99-105. [1]Archived 2015-10-19 at the Wayback Machine
tandfonline.com
Sansom, Robert S. "Phylogeny, classification and character polarity of the Osteostraci (Vertebrata)." Journal of Systematic Palaeontology 7.1 (2009): 95-115. [2]
web.archive.org
White, E. I. "On Cephalaspis lyelli Agassiz." Palaeontology 1.2 (1958): 99-105. [1]Archived 2015-10-19 at the Wayback Machine