Sarah Janssen. (2008). The WORLD almanac and book of facts 2008. World Almanac Books.
Cita Chicago (17th ed.)Sarah Janssen. The WORLD Almanac and Book of Facts 2008. World Almanac Books, 2008.
Cita MLA (9th ed.)Sarah Janssen. The WORLD Almanac and Book of Facts 2008. World Almanac Books, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.