Barkas, T.P. (1873)
A manual of Coal Measure Palaeontology. Illustrated Guide to the fish, amphihian, reptilian and supposed mammalian remains of the Northumherland Carboniferous strata. Hutchings & 'Colliery Guardian', London, 117 pp.
Barkas, T.P. (1869)
Ctenodus interruptus. Scientific Opinion, 2: 113–114