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