Mangano, G. M., Buatois , L. A., West , R. R., & Maples, C. G. (2002). Ichnology of a Pennsylvanian Equatorial Tidal Flat -- The Stull Shale Member at Waverly, Eastern Kansas. Bulletin (Kansas Geological Survey), 245, 1-139. https://journals.ku.edu/kgsbulletin/article/view/22279