APA (7th ed.) Citation

(1981). 1981: Britannica book of the year. Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

1981: Britannica Book of the Year. Chicago: Encyclopaedia Britannica, 1981.

MLA (8th ed.) Citation

1981: Britannica Book of the Year. Encyclopaedia Britannica, 1981.

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