APA (7th ed.) Zitazioa
National Geographic Society (U.S.). (1991). National Geographic picture atlas of our world. The National Geographic Society.
Chicago Style (17th ed.) Zitazioa
National Geographic Society (U.S.). National Geographic Picture Atlas of Our World. Washington D.C: The National Geographic Society, 1991.
MLA (9th ed.) Zitazioa
National Geographic Society (U.S.). National Geographic Picture Atlas of Our World. The National Geographic Society, 1991.
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