Cita APA (7a ed.)
World Almanac Books. (2006). The world almanac and book of facts 2006. World Almanac Books.
Cita Chicago Style (17a ed.)
World Almanac Books. The World Almanac and Book of Facts 2006. New York: World Almanac Books, 2006.
Cita MLA (9a ed.)
World Almanac Books. The World Almanac and Book of Facts 2006. World Almanac Books, 2006.
Precaución: Estas citas no son 100% exactas.