APA (7th ed.) Citation
Allen, W. L. National Geographic: Vol. 191, no. 1, January 1997. National Geographic Society.
Chicago Style (17th ed.) Citation
Allen, William L. National Geographic: Vol. 191, No. 1, January 1997. Washington, EUA: National Geographic Society.
MLA (9th ed.) Citation
Allen, William L. National Geographic: Vol. 191, No. 1, January 1997. National Geographic Society.
Warning: These citations may not always be 100% accurate.