APA (7th ed.) Citation

Liddell Hart, B. H. (1972). History of the first world war. London.

Chicago Style (17th ed.) Citation

Liddell Hart, Basil Henry. History of the First World War. Pan Books: London, 1972.

MLA (9th ed.) Citation

Liddell Hart, Basil Henry. History of the First World War. London, 1972.