APA (7th ed.) Citation

Janssen, S. (2011). The world almanac and book of facts, 2011. World Almanac Books.

Chicago Style (17th ed.) Citation

Janssen, Sarah. The World Almanac and Book of Facts, 2011. New York: World Almanac Books, 2011.

MLA (9th ed.) Citation

Janssen, Sarah. The World Almanac and Book of Facts, 2011. World Almanac Books, 2011.

Warning: These citations may not always be 100% accurate.