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].
Miller & Downs 1948 A cephalopod fauna from the type section of the Pennsylvanian "Winslow Formation" of Arkansas.
Journal of Paleontology, 22 (6): 672-680,fig.1-3, pl.101-103; Tulsa, Okla.
Unklesbay 1962 Pennsylvanian Cephalopods of Oklahoma.
Bulletin of the Oklahoma Geological Survey, 96: 1-150, fig.1-16, tab.1-2, pl.1-19; Norman.