APA (7th ed.) Citation

(1991). The word almanac and book of facts. World Almanac.

Chicago Style (17th ed.) Citation

The Word Almanac and Book of Facts. World Almanac, 1991.

MLA (8th ed.) Citation

The Word Almanac and Book of Facts. World Almanac, 1991.

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