APA (7th ed.) Citation

(1989). The New encyclopedia Britannica. index. A-K. Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

The New Encyclopedia Britannica. Index. A-K. Encyclopedia Britannica, 1989.

MLA (8th ed.) Citation

The New Encyclopedia Britannica. Index. A-K. Encyclopedia Britannica, 1989.

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