Sarah Janssen. (2008). The WORLD almanac and book of facts 2008. World Almanac Books.
Lua i Stíl Chicago (17ú heag.)Sarah Janssen. The WORLD Almanac and Book of Facts 2008. World Almanac Books, 2008.
Lua MLA (9ú heag.)Sarah Janssen. The WORLD Almanac and Book of Facts 2008. World Almanac Books, 2008.
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