APA (7th ed.) Citation

(1940). Britannica book of the year. Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

Britannica Book of the Year. London [u.a.]: Encyclopaedia Britannica, 1940.

MLA (8th ed.) Citation

Britannica Book of the Year. Encyclopaedia Britannica, 1940.

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