APA (7th ed.) Citation

(1967). Encyclopedia Americana ( Volume 20: Navajo to Opium ) (International ed.). Americana Corp..

Chicago Style (17th ed.) Citation

Encyclopedia Americana ( Volume 20: Navajo to Opium ). International ed. New York: Americana Corp., 1967.

MLA (8th ed.) Citation

Encyclopedia Americana ( Volume 20: Navajo to Opium ). International ed. Americana Corp., 1967.

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