APA (7th ed.) Citation

Janssen, S. (2020). The world almanac and book of facts 2021. World Almanac.

Chicago Style (17th ed.) Citation

Janssen, Sarah. The World Almanac and Book of Facts 2021. New York: World Almanac, 2020.

MLA (8th ed.) Citation

Janssen, Sarah. The World Almanac and Book of Facts 2021. World Almanac, 2020.

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