(2005). National Geographic visual history of the world. National Geographic Society.
Chicagoスタイル(17版)引用形式National Geographic Visual History of the World. Washington, D.C: National Geographic Society, 2005.
MLA(9版)引用形式National Geographic Visual History of the World. National Geographic Society, 2005.
警告: この引用は必ずしも正確ではありません.