Não informado. (2009). Annual Report of the Geological Survey of Arkansas. Geological Survey of Arkansas.
Citace podle Chicago (17th ed.)Não informado. Annual Report of the Geological Survey of Arkansas. Little Rock, Ark: Geological Survey of Arkansas, 2009.
Citace podle MLA (8th ed.)Não informado. Annual Report of the Geological Survey of Arkansas. Geological Survey of Arkansas, 2009.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..