Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.