APA (7th ed.) Citation

(1980). The New Encyclopaedia Britannica: In 30 volumes : macropædia : ready reference and index (Fifteenth edition.). Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

The New Encyclopaedia Britannica: In 30 Volumes : Macropædia : Ready Reference and Index. Fifteenth edition. Chicago: Encyclopaedia Britannica, 1980.

MLA (8th ed.) Citation

The New Encyclopaedia Britannica: In 30 Volumes : Macropædia : Ready Reference and Index. Fifteenth edition. Encyclopaedia Britannica, 1980.