Tway, L.E. & Zidek, J. (1983)
Catalog of Late Pennsylvanian ichthyoliths, Part II. Journal of Vertebrate Paleontology, 2(4), 414–438
DOI: 10.1080/02724634.1983.10011944

Tway, L.E. (1979)
Pennsylvanian ichthyoliths from the Shawnee Group of eastern Kansas. The University of Kansas Paleontological Contributions, 96, 1–24