APA (7th ed.) Zitazioa
Grosvenor, M. B. National Geographic: Vol. 131, no. 5, May 1967. National Geographic Society.
Chicago Style (17th ed.) Zitazioa
Grosvenor, Melville Bell. National Geographic: Vol. 131, No. 5, May 1967. Washington, EUA: National Geographic Society.
MLA (9th ed.) Zitazioa
Grosvenor, Melville Bell. National Geographic: Vol. 131, No. 5, May 1967. National Geographic Society.
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