Não informado. (2009). Annual Report of the Geological Survey of Arkansas. Geological Survey of Arkansas.
Style de citation Chicago (17e éd.)Não informado. Annual Report of the Geological Survey of Arkansas. Little Rock, Ark: Geological Survey of Arkansas, 2009.
Style de citation MLA (8e éd.)Não informado. Annual Report of the Geological Survey of Arkansas. Geological Survey of Arkansas, 2009.
Attention : ces citations peuvent ne pas être correctes à 100%.