APA (7th ed.) Citation

Hammerton, J. A. (1920). Harmsworth's universal encyclopedia. Amalgamated Press.

Chicago Style (17th ed.) Citation

Hammerton, John Alexander. Harmsworth's Universal Encyclopedia. London: Amalgamated Press, 1920.

MLA (8th ed.) Citation

Hammerton, John Alexander. Harmsworth's Universal Encyclopedia. Amalgamated Press, 1920.

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