Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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