Não informado. (1866). Geological survey of Illinois. Geology and Palaeontology.
Style de citation Chicago (17e éd.)Não informado. Geological Survey of Illinois. Springfield, Ill: Geology and Palaeontology, 1866.
Style de citation MLA (8e éd.)Não informado. Geological Survey of Illinois. Geology and Palaeontology, 1866.
Attention : ces citations peuvent ne pas être correctes à 100%.