APA
(2009). The World almanac and book of facts 2009. New York: The World Almanac Books.
Chicago
2009. The World almanac and book of facts 2009. New York: The World Almanac Books.
Harvard
(2009). The World almanac and book of facts 2009. New York: The World Almanac Books.
MLA
The World almanac and book of facts 2009. New York: The World Almanac Books. 2009.