APA (7th ed.) Citation

National Geographic Society (U.S.). Book Division. (1998). National geographic eyewitness to the 20th century. The Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Book Division. National Geographic Eyewitness to the 20th Century. Washington, D.C.: The Society, 1998.

MLA (9th ed.) Citation

National Geographic Society (U.S.). Book Division. National Geographic Eyewitness to the 20th Century. The Society, 1998.

Warning: These citations may not always be 100% accurate.