Não informado. (2007). Annual report of the Director to the Board of Trustees. Chicago Natural History Museum.
Citace podle Chicago (17th ed.)Não informado. Annual Report of the Director to the Board of Trustees. Chicago, Ill: Chicago Natural History Museum, 2007.
Citace podle MLA (8th ed.)Não informado. Annual Report of the Director to the Board of Trustees. Chicago Natural History Museum, 2007.
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