Callipterids of the Dunkard Group of the Appalachian Basin: Their identity and paleoenvironmental significanceField Conference of Pennsylvania Geologists, Inc.144–167
DiMichele, William A., Blake, Bascomb M., Cecil, C. B., Fedorko, Nick, Kerp, Hans, and Skema, Viktoras. 2011. "Callipterids of the Dunkard Group of the Appalachian Basin: Their identity and paleoenvironmental significance." In Geology of the Pennsylvanian-Permian in the Dunkard Basin. Guidebook for the 76th Annual Field Conference of Pennsylvania Geologists. Harper, John A., editor. 144–167. Middletown, PA: Field Conference of Pennsylvania Geologists, Inc..