APA-viite (7. p.)
(1981). Images of the world: Photograpphy at the National Geographic. National Geographic Society.
Chicago-viite (17. p.)
Images of the World: Photograpphy at the National Geographic. Washington, DC: National Geographic Society, 1981.
MLA-viite (9. p.)
Images of the World: Photograpphy at the National Geographic. National Geographic Society, 1981.
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