Brenner , Robert L. “Stratigraphy, Petrology, and Paleogeography of the Upper Portion of the Cherokee Group (Middle Pennsylvanian), Eastern Kansas and Northeastern Oklahoma”.
Bulletin (Kansas Geological Survey) (January 1, 1989): 1–70. Accessed April 24, 2025.
https://journals.ku.edu/kgsbulletin/article/view/23537.