Dyfyniad APA

National Geographic Society (U.S.) Special Publications Division. (1979). Mysteries of the ancient world. The Society.

Dyfyniad Arddull Chicago

National Geographic Society (U.S.) Special Publications Division. Mysteries of the Ancient World. Washington: The Society, 1979.

Dyfyniad MLA

National Geographic Society (U.S.) Special Publications Division. Mysteries of the Ancient World. The Society, 1979.

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