Authors	Year	Title
Foord & Crick	1897	Catalogue of the fossil Cephalopoda in the British Museum (Natural History). Part III, containing the Bactritidae and part of the Suborder Ammonoidea). pp.I-XXXIII, 1-303, 145 figs., London.
House	1962	Observations on the ammonoid succesion of the North American Devonian. Journal of Paleontology, 36: 247-284, fig.1-15, tab.1-3, pl.43-48; Tulsa, Okla.
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.