APA (7th ed.) Citation

O'Kelly, M. (2018). The Second World War explained. Pen & Sword Military.

Chicago Style (17th ed.) Citation

O'Kelly, Michael. The Second World War Explained. Barnsley, South Yorkshire: Pen & Sword Military, 2018.

MLA (9th ed.) Citation

O'Kelly, Michael. The Second World War Explained. Pen & Sword Military, 2018.