APA (7th ed.) Citation
(2012). <The> world almanac and book of facts 2012: <the> authority since 1868. World Almanac Books.
Chicago Style (17th ed.) Citation
<The> World Almanac and Book of Facts 2012: <the> Authority Since 1868. New York: World Almanac Books, 2012.
MLA (9th ed.) Citation
<The> World Almanac and Book of Facts 2012: <the> Authority Since 1868. World Almanac Books, 2012.
Warning: These citations may not always be 100% accurate.