Παραπομπή APA
National Geographic Society (U.S.). (1997). The complete National Geographic: 108 years of National Geographic magazine on CD-ROM. Washington, D.C. : Novato, CA: National Geographic Interactive.
Παραπομπή Chicago StyleNational Geographic Society (U.S.). The Complete National Geographic: 108 Years of National Geographic Magazine On CD-ROM. Washington, D.C. : Novato, CA: National Geographic Interactive, 1997.
Παραπομπή MLANational Geographic Society (U.S.). The Complete National Geographic: 108 Years of National Geographic Magazine On CD-ROM. Washington, D.C. : Novato, CA: National Geographic Interactive, 1997.
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