Παραπομπή σε μορφή APA (7η εκδ.)

(1972). Fence diagram and geologic column of Pennsylvanian and Upper Mississippian rocks of the Upper Tradewater basin, Kentucky. Washington, D C : United States Department of Interior.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Fence Diagram and Geologic Column of Pennsylvanian and Upper Mississippian Rocks of the Upper Tradewater Basin, Kentucky. Washington, D C : United States Department of Interior, 1972.

Παραπομπή σε μορφή MLA (9th εκδ.)

Fence Diagram and Geologic Column of Pennsylvanian and Upper Mississippian Rocks of the Upper Tradewater Basin, Kentucky. Washington, D C : United States Department of Interior, 1972.