APA (7th ed.) Citation

(1986). The new encyclopædia Britannica (15th ed.). Encyclopædia Britannica, Inc..

Chicago Style (17th ed.) Citation

The New Encyclopædia Britannica. 15th ed. Chicago [etc.]: Encyclopædia Britannica, Inc., 1986.

MLA (9th ed.) Citation

The New Encyclopædia Britannica. 15th ed. Encyclopædia Britannica, Inc., 1986.

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