National Geographic Society (U.S.) Special Publications Division. (1979). Mysteries of the ancient world. The Society.
芝加哥风格引文National Geographic Society (U.S.) Special Publications Division. Mysteries of the Ancient World. Washington: The Society, 1979.
MLA引文National Geographic Society (U.S.) Special Publications Division. Mysteries of the Ancient World. The Society, 1979.
警告：这些引文格式不一定是100％准确.