American Association of Petroleum Geologists & Branson, C. C. (1962). Pennsylvanian system in the United States: A symposium. American Association of Petroleum Geologists.
Citace podle Chicago (17th ed.)American Association of Petroleum Geologists a Carl C. Branson. Pennsylvanian System in the United States: A Symposium. Tulsa, Okla: American Association of Petroleum Geologists, 1962.
Citace podle MLA (8th ed.)American Association of Petroleum Geologists a Carl C. Branson. Pennsylvanian System in the United States: A Symposium. American Association of Petroleum Geologists, 1962.
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