APA (7th ed.) Citation

(1975). The New Encyclopaedia Britannica (15th ed.). Encyclopedia Britannica, inc.

Chicago Style (17th ed.) Citation

The New Encyclopaedia Britannica. 15th ed. Chicago: Encyclopedia Britannica, inc, 1975.

MLA (9th ed.) Citation

The New Encyclopaedia Britannica. 15th ed. Encyclopedia Britannica, inc, 1975.

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