APA (7th ed.) Citation

(1990). The New Encyclopaedia Britannica (15th ed.). Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

The New Encyclopaedia Britannica. 15th ed. Chicago: Encyclopaedia Britannica, 1990.

MLA (8th ed.) Citation

The New Encyclopaedia Britannica. 15th ed. Encyclopaedia Britannica, 1990.

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