Cita APA (7a ed.)

(2006). The World almanac and book of facts, 2006. World Almanac Books.

Cita Chicago Style (17a ed.)

The World Almanac and Book of Facts, 2006. New York: World Almanac Books, 2006.

Cita MLA (9a ed.)

The World Almanac and Book of Facts, 2006. World Almanac Books, 2006.