APA (7th ed.) Citation

(1980). The New Encyclopedia Britannica in 30 volumes (15th ed.). Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

The New Encyclopedia Britannica in 30 Volumes. 15th ed. London: Encyclopedia Britannica, 1980.

MLA (8th ed.) Citation

The New Encyclopedia Britannica in 30 Volumes. 15th ed. Encyclopedia Britannica, 1980.

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