APA (7th ed.) Citation

(1980). The New Encyclopaedia Britannica (15th. ed.). Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

The New Encyclopaedia Britannica. 15th. ed. Chicago: Encyclopedia Britannica, 1980.

MLA (8th ed.) Citation

The New Encyclopaedia Britannica. 15th. ed. Encyclopedia Britannica, 1980.

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