Authors	Year	Title
House	1956	Devonian Goniatites from North Cornwall. Geological Magazine, 9342: 257-262, fig.1; London.
House	1963	Devonian ammonoid successions and facies in Devon and Cornwall. Quarterly Journal of the Geological Society of London, 119: 1-27, fig.1-8, pl.1-4; London.
Posser & Kindle	1913	Cephalopoda [of the Middle Devonian of Maryland]. Maryland Geological Survey, Middle and Upper Devonian: 307-326, pl.38-42; Baltimore.