Não informado. (2004). Information Circular. Department of Natural Resources, Division of Geological Survey.
Citace podle Chicago (17th ed.)Não informado. Information Circular. Columbus, Ohio: Department of Natural Resources, Division of Geological Survey, 2004.
Citace podle MLA (8th ed.)Não informado. Information Circular. Department of Natural Resources, Division of Geological Survey, 2004.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..