APA
National Geographic Society, . (1997). The complete National Geographic. Washington, D.C: National Geographic Society.
Chicago
National Geographic Society, . 1997. The complete National Geographic. Washington, D.C: National Geographic Society.
Harvard
National Geographic Society, . (1997). The complete National Geographic. Washington, D.C: National Geographic Society.
MLA
National Geographic Society, . The complete National Geographic. Washington, D.C: National Geographic Society. 1997.
