APA (7th ed.) Citation

(1910). The Harmsworth encyclopaedia: Everybody's book of reference ; containing 50,000 articles, profusely illustrated. Amalgamated Press [u.a.].

Chicago Style (17th ed.) Citation

The Harmsworth Encyclopaedia: Everybody's Book of Reference ; Containing 50,000 Articles, Profusely Illustrated. London: Amalgamated Press [u.a.], 1910.

MLA (9th ed.) Citation

The Harmsworth Encyclopaedia: Everybody's Book of Reference ; Containing 50,000 Articles, Profusely Illustrated. Amalgamated Press [u.a.], 1910.