Pennsylvanian-Permian vegetational changes in tropical EuramericaField Conference of Pennsylvania Geologists, Inc.60–102
DiMichele, William A., Cecil, C. B., Chaney, Dan S., Elrick, Scott D., Lucas, Spencer G., Lupia, Richard, Nelson, W. J., and Tabor, Neil J. 2011. "Pennsylvanian-Permian vegetational changes in tropical Euramerica." In Geology of the Pennsylvanian-Permian in the Dunkard Basin. Guidebook for the 76th Annual Field Conference of Pennsylvania Geologists. Harper, John A., editor. 60–102. Middletown, PA: Field Conference of Pennsylvania Geologists, Inc..