Cita APA (7a ed.)

World Almanac Books. (2004). The world almanac and book of facts 2004. World Almanac Education Group.

Cita Chicago Style (17a ed.)

World Almanac Books. The World Almanac and Book of Facts 2004. New York: World Almanac Education Group, 2004.

Cita MLA (9a ed.)

World Almanac Books. The World Almanac and Book of Facts 2004. World Almanac Education Group, 2004.