Sarah Janssen. (2008). The WORLD almanac and book of facts 2008. World Almanac Books.
Chicago-čujuhus (17. p.)Sarah Janssen. The WORLD Almanac and Book of Facts 2008. World Almanac Books, 2008.
MLA-čujuhus (9. p.)Sarah Janssen. The WORLD Almanac and Book of Facts 2008. World Almanac Books, 2008.
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