	Authors	Year	Title
	Gordon	1965	Carboniferous Cephalopods of Arkansas. Professional Papers, U.S. Geological Survey, 460: 1-322, fig.1-96, pl.1-32; Washington. [imprint 1964].
	Gordon	1971	Goniatites americanus n. sp., a late Meramec (Mississippian) index fossil. Professional Paper US Geol.Survey 750-C: C39-C43, fig.1-3, 1 tab.; Washington.