APA (7th ed.) Citation

(1967). Encyclopedia Americana (Volume 30: Index) (International ed.). Americana Corp..

Chicago Style (17th ed.) Citation

Encyclopedia Americana (Volume 30: Index). International ed. New York: Americana Corp., 1967.

MLA (8th ed.) Citation

Encyclopedia Americana (Volume 30: Index). International ed. Americana Corp., 1967.

Warning: These citations may not always be 100% accurate.