Cita APA
World Almanac Books. (2006). The world almanac and book of facts 2006. World Almanac Books.
Citación estilo Chicago
World Almanac Books. The World Almanac and Book of Facts 2006. New York: World Almanac Books, 2006.
Cita MLA
World Almanac Books. The World Almanac and Book of Facts 2006. World Almanac Books, 2006.
Warning: These citations may not always be 100% accurate.