Não informado. (2007). Annual report of the Director to the Board of Trustees. Chicago Natural History Museum.
Chicago-Zitierstil (17. Ausg.)Não informado. Annual Report of the Director to the Board of Trustees. Chicago, Ill: Chicago Natural History Museum, 2007.
MLA-Zitierstil (8. Ausg.)Não informado. Annual Report of the Director to the Board of Trustees. Chicago Natural History Museum, 2007.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.