Não informado. (2007). Annual report of the Director to the Board of Trustees. Chicago Natural History Museum.
Chicago-referens (17:e uppl.)Não informado. Annual Report of the Director to the Board of Trustees. Chicago, Ill: Chicago Natural History Museum, 2007.
MLA-referens (8:e uppl.)Não informado. Annual Report of the Director to the Board of Trustees. Chicago Natural History Museum, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.