National Geographic Society. Special Publications Division. (1986). Builders of the ancient world: Marvels of engineering. The Society.
Citação do estilo Chicago (17ª ed.)National Geographic Society. Special Publications Division. Builders of the Ancient World: Marvels of Engineering. Washington, D.C: The Society, 1986.
Citação MLA (9ª ed.)National Geographic Society. Special Publications Division. Builders of the Ancient World: Marvels of Engineering. The Society, 1986.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.