APA (7th ed.) Citation

(1974). The New Encyclopaedia Britannica (15th ed.). Encyclopaedia Britannic.

Chicago Style (17th ed.) Citation

The New Encyclopaedia Britannica. 15th ed. Chicago: Encyclopaedia Britannic, 1974.

MLA (8th ed.) Citation

The New Encyclopaedia Britannica. 15th ed. Encyclopaedia Britannic, 1974.

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