Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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