APA (7th ed.) Citation

(1981). The New Britannica / Webster Dictionary & Reference Guide. Encyclopaedia Britannica, Inc.

Chicago Style (17th ed.) Citation

The New Britannica / Webster Dictionary & Reference Guide. U.S.A: Encyclopaedia Britannica, Inc, 1981.

MLA (9th ed.) Citation

The New Britannica / Webster Dictionary & Reference Guide. Encyclopaedia Britannica, Inc, 1981.

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