(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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)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.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.