	Authors	Year	Title
	Boardman, Work & Mapes	1994	Biostratigraphy of Middle and Late Pennsylvanian (Desmoinesian-Virgilian) ammonoids. [Boardman,D.R., D.M.Work, Mapes,R.H. & Barrick,J.E.]. Kansas Geological Survey Bulletin 232, 121 p., 26 figs., 1 tabl., 5 pls., Lawrence, KS.
	Boardman, Work & Mapes	1994	Revision of the family Shumarditidae Plummer & Scott, 1937. Kansas Geological Survey Bulletin, 232: 48-56, figs.23-26.