APA (7th ed.) Citation

Encyclopaedia Inc. (1989). The New Encyclopaedia Britannica Volume 18. Encyclopaedia Inc.

Chicago Style (17th ed.) Citation

Encyclopaedia Inc. The New Encyclopaedia Britannica Volume 18. Chicago: Encyclopaedia Inc, 1989.

MLA (9th ed.) Citation

Encyclopaedia Inc. The New Encyclopaedia Britannica Volume 18. Encyclopaedia Inc, 1989.

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