Não informado. (1866). Geological survey of Illinois. Geology and Palaeontology.
Lua i Stíl Chicago (17ú heag.)Não informado. Geological Survey of Illinois. Springfield, Ill: Geology and Palaeontology, 1866.
Lua MLA (8ú heag.)Não informado. Geological Survey of Illinois. Geology and Palaeontology, 1866.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.