APA (7th ed.) Citation

Encyclopædia Britannica, Inc. (1940). Britannica Book of the Year .. Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

Encyclopædia Britannica, Inc. Britannica Book of the Year .. Chicago: Encyclopaedia Britannica, 1940.

MLA (9th ed.) Citation

Encyclopædia Britannica, Inc. Britannica Book of the Year .. Encyclopaedia Britannica, 1940.

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