	Authors	Year	Title
	Saunders & Swan	1984	Morphology and morphologic diversity of mid-Carboniferous (Namurian) ammonoids in time and space. Paleobiology, 10 (2): 195-228, 22 fig., Appendices.
	Swan & Saunders	1987	Function and Shape in Late Paleozoic (Mid-Carboniferous) ammonoids. Paleobiology, 13 (3): 297-311, 13 fig.