APA (7th ed.) Citation

Encyclopaedia Britannica Inc. (1768). Encyclopaedia Britannica Volume 21. William Benton, Publisher.

Chicago Style (17th ed.) Citation

Encyclopaedia Britannica Inc. Encyclopaedia Britannica Volume 21. Chicago: William Benton, Publisher, 1768.

MLA (9th ed.) Citation

Encyclopaedia Britannica Inc. Encyclopaedia Britannica Volume 21. William Benton, Publisher, 1768.

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