APA (7th ed.) Citation

Instititute, A. (1975). The encyclopedia americana. Volume VII. Americana Corporation.

Chicago Style (17th ed.) Citation

Instititute, American. The Encyclopedia Americana. Volume VII. Americana Corporation, 1975.

MLA (8th ed.) Citation

Instititute, American. The Encyclopedia Americana. Volume VII. Americana Corporation, 1975.

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