APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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