APA (7. basım) Alıntı
Garret, W. E. National Geographic: Vol. 176, no. 4, October 1989. National Geographic Society.
Chicago Style (17. basım) Atıf
Garret, Wilbur E. National Geographic: Vol. 176, No. 4, October 1989. Washington, EUA: National Geographic Society.
MLA (9th ed.) Atıf
Garret, Wilbur E. National Geographic: Vol. 176, No. 4, October 1989. National Geographic Society.
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