APA (7th ed.) Citation

Urban, T. (2020). The Katyn massacre 1940: History of a crime. Pen & Sword Military.

Chicago Style (17th ed.) Citation

Urban, Thomas. The Katyn Massacre 1940: History of a Crime. Barnsley, South Yorkshire, UK: Pen & Sword Military, 2020.

MLA (9th ed.) Citation

Urban, Thomas. The Katyn Massacre 1940: History of a Crime. Pen & Sword Military, 2020.