APA (7th ed.) Citation
(1977). National geographic index: 1947-1976 (inclusive) (ed.). National geographic society.
Chicago Style (17th ed.) Citation
National Geographic Index: 1947-1976 (inclusive). ed. Washington,D.C.: National geographic society, 1977.
MLA (9th ed.) Citation
National Geographic Index: 1947-1976 (inclusive). ed. National geographic society, 1977.
Warning: These citations may not always be 100% accurate.