Stenzel, H.B., E.K. Krause & J.T. Twining. 1957. Pelecypoda from the type locality of the Stone City Beds (Middle Eocene). Bureau of Economic Geology, The Univesity of Texas, Austin 5704: 1-237, pls. 1-22. Available electronically.
Stenzel & Twinging in Stenzel et al., 1957. Bur. Econ.Geol., Texas 5704: 182.