APA (7th ed.) Citation

Zilliacus, K. (1939). Between two wars?: The lessons of the last world war in relation to preparation for the next. Penguin Books.

Chicago Style (17th ed.) Citation

Zilliacus, K. Between Two Wars?: The Lessons of the Last World War in Relation to Preparation for the Next. Harmondsworth, Eng.: Penguin Books, 1939.

MLA (8th ed.) Citation

Zilliacus, K. Between Two Wars?: The Lessons of the Last World War in Relation to Preparation for the Next. Penguin Books, 1939.