Citazione Stile APA (7a Edizione)

(2005). National Geographic visual history of the world. National Geographic Society.

Citazione stile Chigago Style (17a edizione)

National Geographic Visual History of the World. Washington, D.C: National Geographic Society, 2005.

Citatione MLA (9a ed.)

National Geographic Visual History of the World. National Geographic Society, 2005.