Doveton, J.H., R.R. Charpenteir, and E.P. Metzger. “Lithofacies Analysis of the Simpson Group in South-Central Kansas”.
Bulletin (Kansas Geological Survey) (January 1, 1990): 1–34. Accessed April 12, 2025.
https://journals.ku.edu/kgsbulletin/article/view/23591.