Cita APA (7a ed.)
(2003). <The> World almanac and book of facts 2003: <the> authority since 1868. World Almanac Books.
Cita Chicago Style (17a ed.)
<The> World Almanac and Book of Facts 2003: <the> Authority Since 1868. New York: World Almanac Books, 2003.
Cita MLA (9a ed.)
<The> World Almanac and Book of Facts 2003: <the> Authority Since 1868. World Almanac Books, 2003.
Precaución: Estas citas no son 100% exactas.