Dyfyniad APA

(1999). National Geographic Atlas of the World (7th ed.). National geographic society.

Dyfyniad Arddull Chicago

National Geographic Atlas of the World. 7th ed. Washington D. C.: National geographic society, 1999.

Dyfyniad MLA

National Geographic Atlas of the World. 7th ed. National geographic society, 1999.

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