APA (7th ed.) Citation

(1989). The new encyclopaedia Britannica. Encyclopaedia Britannica Inc.

Chicago Style (17th ed.) Citation

The New Encyclopaedia Britannica. Chicago: Encyclopaedia Britannica Inc, 1989.

MLA (9th ed.) Citation

The New Encyclopaedia Britannica. Encyclopaedia Britannica Inc, 1989.

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