Dyfyniad APA
(1979). Mysteries of the ancient world. National Geographic Society.
Dyfyniad Arddull Chicago
Mysteries of the Ancient World. Washington D.C.: National Geographic Society, 1979.
Dyfyniad MLA
Mysteries of the Ancient World. National Geographic Society, 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.