APA (7e ed.) Bronvermelding

(2018). The World almanac and book of facts: 2018 (150th Anniversary Edition.). World Almanac Books.

Chicago (17e ed.) Bronvermelding

The World Almanac and Book of Facts: 2018. 150th Anniversary Edition. New York, New York: World Almanac Books, 2018.

MLA (9e ed.) Bronvermelding

The World Almanac and Book of Facts: 2018. 150th Anniversary Edition. World Almanac Books, 2018.