Pleasant Hill GapField Conference of Pennsylvania Geologists, Inc168–173
DiMichele, William A., Skema, Vik, and Harper, John A. 2011. "Pleasant Hill Gap." In Geology of the Pennsylvanian-Permian in the Dunkard basin. Guidebook, 76th Annual Field Conference of Pennsylvania Geologists. Harper, John A., editor. 168–173. Middletown, PA: Field Conference of Pennsylvania Geologists, Inc.