APA (7th ed.) Citation

Britannica book of the year. (1990). Britannica world data annual. Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

Britannica book of the year. Britannica World Data Annual. Chicago: Encyclopedia Britannica, 1990.

MLA (9th ed.) Citation

Britannica book of the year. Britannica World Data Annual. Encyclopedia Britannica, 1990.

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