APA (7th ed.) Zitazioa
Garret, W. E. National Geographic: Vol. 170, no. 6, December 1986. National Geographic Society.
Chicago Style (17th ed.) Zitazioa
Garret, Wilbur E. National Geographic: Vol. 170, No. 6, December 1986. Washington, EUA: National Geographic Society.
MLA (9th ed.) Zitazioa
Garret, Wilbur E. National Geographic: Vol. 170, No. 6, December 1986. National Geographic Society.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.