Tohutoro APA (7th ed.)
Wanless, H. R. (1939). Pennsylvanian Correlations in the Eastern Interior and Appalachian coal fields.
Tohutoru Kātū Chicago (17th ed.)
Wanless, Harold Rollin. Pennsylvanian Correlations in the Eastern Interior and Appalachian Coal Fields. New York, 1939.
Tohutoro MLA (9th ed.)
Wanless, Harold Rollin. Pennsylvanian Correlations in the Eastern Interior and Appalachian Coal Fields. 1939.
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