(2007). The Americana Annual 2007The Encyclopedia of the Events of 2006, Yearbook of the encyclopedia Americana. The World Bank.
Chicago-referens (17:e uppl.)The Americana Annual 2007The Encyclopedia of the Events of 2006, Yearbook of the Encyclopedia Americana. The World Bank, 2007.
MLA-referens (8:e uppl.)The Americana Annual 2007The Encyclopedia of the Events of 2006, Yearbook of the Encyclopedia Americana. The World Bank, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.